text: As June approached, Angelo had run out of ideas. He'd uncovered nothing to bring him any closer to understanding the epidemiology of the feline disease. He prepared to fly to Seattle. But first he wanted to talk with Pete Wingate.
  
  He drove ten miles east along Highway 118 to the Wingate farm. The red barn with its water tank and white-frame house, complete with chickens and ducks, reminded Angelo of picture books he'd read as a child in Norway. Irma Wingate set out home-baked rolls with coffee, making Angelo feeling welcome. He chatted with the couple about crops and weather, displaying a sincere interest in farming. This was not at all an affectation, as Angelo's interests were eclectic. Finally, he asked about the cat named Clyde.
  
  "Yup," said the farmer, "I took a cat over to Dorothy Knowland in February. I remember, because it was Valentine's Day." He nodded toward an Irish Setter asleep on the rug. "Mike over there don't take too well with cats."
  
  "How long had you had the cat?"
  
  "Just a week. The wife and I had been up to Seattle visiting my sister—"
  
  "Seattle? Did you say Seattle?" Angelo scrawled on his tablet.
  
  "Right. She volunteers at the zoo there, and they had this cat they called Clyde that was sort of a mascot. Clyde was allowed to go wherever he pleased in the zoo. They finally had to get rid of him because he kept getting into the animal compounds. It's one of those zoos that don't have many cages, just a lot of open spaces with moats or pits around them. They were afraid one of the big animals would injure that cat. I figured I could give it a good home on the farm. The wife didn't mind, so we brought it back with us, but Mike wouldn't share the farm with no cat, and Clyde had to go."
  
  "What is your sister's name, please?"
  
  "Geraldine," answered Pete. "Geraldine Moore."
  
  "Thank you," Angelo said, "you have been very helpful."
  
  Driving back to Camarillo, he hardly noticed the scenic countryside. Angelo's mind was churning. There it is, he thought, the connection I've been searching for... tenuous link to be sure, but a link nonetheless—a tie between the Camarillo and Seattle diseases. Angelo figured that the cat known as Clyde would turn out to be the index case, the first instance of the disease, marking the beginning of the epizootic. But what's the association with the university? Where do Chamberlin's plasmids fit in... or the sarcoma virus?
  
  At five thirty in the morning, on the first day of June, Angelo headed his rental car back to LAX, arriving two hours before his flight. He always took along a supply of reading material, so the interminable waiting wouldn't be wasted. Dorothy had been sad to see him go, but Angelo promised he would return. He had no professional reason to come back to Camarillo, but during the past few weeks, he had become very fond of the widow, and he was determined to see her again.
  
  On the plane, he began to review his copious notes, but the flight was short, and soon they were landing at Sea-Tac airport. He rented a car identical to the one he had in California and drove north in the rain to the city. He intended to go straight to the zoo to see Wingate's sister even before he found a place to stay.
  
  Angelo arrived just after the noon hour. The zoo was bustling with excited schoolchildren and young couples, all seemingly oblivious to the light rain. At the administration building, he was told that Geraldine Moore was taking a group of Japanese businessmen on a special tour and would be finished in an hour.
  
  Angelo elected to go on a tour of his own. To get out of the rain, he went into an exhibit building. He found it quite dark inside; he could hardly see his way. He then noticed a sign with the information that the room housed nocturnal animals. Indeed, the only illumination came from the glass-enclosed cages, lit by a dim, bluish light. As his eyes adapted, Angelo spied an anteater, a sloth moving about slowly in a faux treetop, and, below them, a porcupine.
  
  A door at the end of the corridor led to the well-lit reptile room. Here, he found slow-moving tortoises, gopher snakes, lizards, and rattlers, as well as hairy tarantulas and various kinds of insects.
  
  He went through yet another door into a room identified as a tropical forest display. A light rain was falling on the animals. A flash of bright movement caught his eye, and he observed a couple of golden tamarins. They were the most beautiful primates he had ever seen. Their long, silky-golden hair would be the envy of many a young woman—or young man for that matter, he thought. Angelo passed some time observing a variety of tropical insects. Just then, a group of noisy youngsters shepherded by their teacher came in, and he figured it was time to leave the building. A bit of rain was preferable to yelling kids.
  
  Pete Wingate is right, he thought, there aren't many cages. The large animals—lions, llamas, apes, and the like—were able to roam in sizable open areas with few fences separating them from the observers. Only the smaller animals, such as monkeys, were caged. Angelo watched the gorillas for a while. Although they were free to move about over a considerable area, they were kept from the public by large, glass panels. In back of one of these panels was a mother with a watchful eye on her tiny baby frolicking a few feet away.
  
  Angelo looked around him at the many open areas. I suspect that viruses could easily be transferred from animal to animal in this zoo; insects could carry them—biting flies, maybe.
  
  Shortly, Angelo passed the bamboo-enclosed elephant compound where African and Indian elephants of various ages comprised a happy family, seemingly oblivious to species differences. He ambled past the polar-bear enclosure and meandered over to look at the big cats. He eyed the dozing lions in an area landscaped to resemble an African savannah, complete with flat-topped acacia trees. He walked around the perimeter, noticing at the back only a four-foot chain-link fence enclosing the area. Inside was a deep, water-filled moat, presumably large enough to keep the cats in. Angelo looked it over. Would it keep a small domestic cat like Clyde out? I don't think so.
  
  The tigers were similarly enclosed. The lithe cougars, on the other hand, were in cages surrounded by a fine-mesh screen that a small cat would not be able to penetrate.
  
  Angelo moseyed over to an imposing building, in front of which were two stone lions in the classic pose. This turned out to be the feline house. Inside, he came upon a sleeping lynx within a glass-fronted cage. Next to it was a flashy ocelot. Further on, there were quite a few species with which he was unfamiliar. These creatures are in close proximity; it's not difficult to imagine viruses hopping from cat to cat. He jotted down his thoughts.
  
  He found fishing and Chinese desert cats, flat-headed and Pallas's cats. Stalking caracals and restless sand cats were in cages on the other side of the hall. There were, all in all, dozens of species new to him, ranging in size from smaller than a house pet to almost the size of a panther. I should have brought Dorothy with me—she would have enjoyed seeing all these cats. Angelo became so caught up with the animals, he returned to the administration building a half-hour later than he had planned.
  
  Geraldine Moore, a slim, middle-aged woman, was waiting for him. She introduced herself and told Angelo that her brother had phoned to tell her of the investigation. She invited Angelo into a small meeting room festooned with a colorful collection of animal posters, photographs, and newspaper clippings about the zoo. In one corner Angelo glimpsed a few small bookcases housing a modest library. He noticed that the woman's uniform was a size too large for her. The two sat at a worktable and Angelo asked Moore about Clyde.
  
  "Yes," said the woman, "we had to find a new home for him because he'd become a little too curious, even for a cat. He had gotten in the habit of going into various animal compounds looking for mice, and, one evening, he frightened one of the elephants. It took half the night for our people to calm the animal."
  
  "Scandaloose."
  
  "Another time, Clyde went down into the gorilla grotto and almost got mauled by Godzilla."
  
  "Godzilla?"
  
  "That's our largest male. Besides, there was always a danger that one of our animals could contract toxoplasmosis from a domestic cat. Anyway, that's when we decided we had to find a new home for the cat."
  
  "You are aware of the feline epizootic in this city?" asked Angelo.
  
  "Why yes, of course. It's terrible. But what has that got to do with Clyde? Is he okay?"
  
  "I'm sorry. I assumed you knew. Clyde is dead. Maybe the epizootic has nothing to do with Clyde. I don't know. But in the city where he was taken, the city where your brother lives, there is also, as you know, a feline epizootic. It would be odd if the two diseases were not related."
  
  "I see." Geraldine Moore pondered this a moment. "But Clyde wasn't ill. If he had been, I never would have given him to my brother."
  
  "Possibly the cat was in the early stages of disease. Anyway, he is dead now. He died of the same disease that has killed all the domestic cats in Camarillo."
  
  "All the cats?... I... I had no idea... Oh, my God!"
  
  "Absolut. All the cats." Angelo paused to let this sink in. He then asked, "Tell me, were any of the zoo animals sick in the month or so before your brother took the cat?"
  
  "Why yes, as a matter of fact, we lost three cats. In September of last year, a lioness came down with a viral or bacterial disease, we're not sure which, and died three weeks later. Then, about the middle of October, we lost one of the two Felis chaus. Two days before Halloween, one of our European wildcats became ill and died after a couple of weeks." She frowned. "Wait a minute. There was another—a chimp we found dead one morning of an unknown cause."
  
  At this, out came Angelo's e-tablet. "Please, what is common name of Felis cha... cha..."
  
  Geraldine Moore smiled. "It is called the jungle cat. It comes from Southeast Asia, India, places like that. Ours came from Egypt."
  
  "How many species of cats are there? Do you know?"
  
  "Thirty-seven in all, I believe."
  
  Angelo was trembling with excitement, but he asked in a calm voice, "What do you do with the body of an animal that dies in the zoo?"
  
  "We usually incinerate them."
  
  "These cats, were they incinerated?"
  
  "Yes. Their bodies were incinerated."
  
  "Scandaloose!"
  
  "I am sorry. I suppose you wanted to examine them."
  
  Angelo nodded. "It would have helped."
  
  She continued, "Of course, our people always perform a necropsy on animals that die from causes other than old age, and we do have some frozen tissue specimens. Would they be of any use to you?"
  
  "Absolut!" said Angelo. "I will need to arrange for keeping them frozen."
  
  "No problem. We have insulated containers for that purpose. We do it all the time. All we need to do is order some dry ice."
  
  "Marveloose!" Angelo thought a moment. "I noticed that many of the animals are out in the open, but others are in cages. Could Clyde have gotten into the glass cages like the ones in the feline house?"
  
  "No, not likely." She stood up. "Come, I'll take you into the feline area."
  
  "I have already been there."
  
  "But I will take you behind the scenes," she responded with an air of mysterious playfulness, "the part the public never sees."
  
  Inside the feline house, Moore unlocked a door marked "NO ADMITTANCE—EMPLOYEES ONLY" and, entering first, she stepped into a shallow tray containing spongy Astroturf saturated with a soapy-looking liquid. "What is that?" Angelo asked.
  
  "It's disinfectant. It is supposed to kill viruses and bacteria that we might bring in from the outside."
  
  "That's convincing." Angelo stepped into the tray. Inside he noticed a decidedly gamey, but not overpowering, animal odor. He followed the docent on a raised wooden walkway along a corridor, well lit by a skylight. They climbed a metal staircase to the roof, and Moore opened a door leading out.
  
  The rain had stopped. The two made their way across a catwalk overlooking the lion compound. A large wall separated the lions from the tigers.
  
  "Look down," Moore said. Immediately below, Angelo spied three lions sleeping on a rock platform.
  
  The docent pointed to the rock above them, as tall as a house. "That rock is entirely man-made—sprayed concrete over a foundation. The platform is heated so the lions can keep warm in winter, and yet be in full view of the public. The entire compound is surrounded by a dry moat that keeps the lions in. The chain-link fence outside the moat serves a primarily psychological purpose. It would keep neither the lions from getting out nor people from getting in if they wanted to."
  
  "A cat could get over that fence, no?"
  
  "I think it's a tad too high for a small cat to scale."
  
  "Was Clyde ever inside the feline house? Inside the back part where we were?"
  
  "Oh yes, quite often he would come begging for handouts. And he seemed to be quite interested in his various cousins."
  
  "Cousins?"
  
  "Yes. Some of these smaller cats, the sand cat for example, are thought to be closely related to the domestic cat."
  
  Angelo stared, closed-mouthed, at the docent. He remained thus for fifteen seconds. Finally, he scribbled feverishly on the tablet.
  
  He thanked Moore and left to find a place to stay. Once checked into a motel near the zoo, he drove down to the waterfront for a meal of fried clams. He studied his notes as he ate. It's all coming together... but I don't see where that Chamberlin fellow fits in. If the disease started here in Seattle, it can't also have started in Chamberlin's lab. Suddenly he had an urge to talk with Dorothy. He wiped his hands and pulled out his vid-phone.
  
  She answered immediately. "Angelo! Oh, I miss you so."
  
  "You do?" He wasn't feigning surprise. Until that moment, Angelo hadn't realized that his affection for Dorothy was reciprocated in kind. "I... miss you too. That's why I called."
  
  She saw that Angelo's hair was unkempt. "You look tired," she said. "When are you coming back? Have you found out how the cat illness got from Camarillo to Seattle?"
  
  "Aha! To the first question, I think I have another five or six days of work here. To the second, I have to unask your question."
  
  "Angelo, that's silly. You can't unask a question. What do you mean, anyway?"
  
  "Dorothy, suppose I told you that the disease didn't start in Camarillo at all, but entered your city from Seattle when the cat called Clyde brought it from the zoo here."
  
  Dorothy was silent. She stared at her phone, open-mouthed. "Yes, I'm here," she said, finally. I... are you telling me that the disease didn't get started at the university... that it was brought to Camarillo from Seattle?"
  
  "Yes, my dear, that is exactly what the evidence is pointing to. However, I ask that you not tell anyone just yet. I need to wait until I'm absolutely certain. There's no room for error here. Careers are at stake."
  
  "I understand. This is really important, isn't it?"
  
  "Yes, it definitely is... Dorothy, I... the first thing I'm going to do when I return to Camarillo is hold you in my arms." He closed the phone, preventing her from answering.
  
  Before he returned to the motel, Angelo stopped by the zoo and learned that a dozen specimens from the three dead animals—spleen, liver, lymph nodes, and the like—were already on their way to the airport for their flight to the CDC.
  
  During the week, while he waited impatiently for the results of the tissue analyses from the CDC, Angelo collected scrapings and soil from the zoo, as well as samples of nasal swabs, urine, and feces from zoo personnel. He traveled all over the city, talking with cat owners and veterinarians, collecting samples everywhere he went. He didn't obtain much information he hadn't already learned in Camarillo, so he ended his Seattle investigation and prepared to return to California. On Friday, June 5, the day before his departure, Angelo phoned Bronkowski in Atlanta, who boomed, "Congratulations, Angelo, it looks like you've cracked this case."
  
  "Oh? What is it? I have heard nothing."
  
  Bronkowski said, "Here, I'll let you talk with Carlson. He's been supervising the lab work."
  
  Vince Carlson came on the line. "Hello, Angelo, good work."
  
  "What? What did you find?" Angelo's heart was pounding.
  
  "It's not like anything we've seen before. It's a retrovirus with multiple envelope genes derived from both FeLV and FIV. Nicky is rerunning the pyros just to be absolutely sure there wasn't a screw-up. Also, there are some sequences we haven't yet identified. We're running comparisons with genomic databases as we speak. We found the virus in both the Camarillo and Seattle tissue samples. However, there are quite a few mutations in the envelope sequences from sample to sample. It probably has a high mutation frequency like HIV."
  
  "Well, that is interesting, indeed. Anything else?"
  
  "Uhm... oh, yes. The virus is extremely stable. We've dehydrated samples to a degree that would inactivate most other viruses, but this baby retains 95 percent infectivity. This may explain why the virus spreads so fast. It doesn't lose much activity in the environment. I don't know of any other virus so robust."
  
  "I see," said Angelo quietly.
  
  "And," continued Carlson, "it's unusually resistant to ultraviolet radiation, so sunlight isn't going to knock it out quickly. We found that full sun takes thirty-three hours to kill half the virus in clinical samples."
  
  "Scandaloose! What have we got here?" Angelo shook his head. "Will you please send me a complete written report of the findings so far?"
  
  "But aren't you coming back to Atlanta now?"
  
  "No, there is some unfinished business here, or rather in Camarillo. There are still some pieces missing from the puzzle."
  
  Angelo heard loud conversation in the background; Bronkowski then came on the line. "Angelo, I want you back here now," he demanded. "Your work is done there, and we've just learned of a possible Lyme outbreak in New England."
  
  "No. I am not finished." He kept his voice low. "There is still a question about the molecular biology lab at the California University. I don't see where it fits in yet."
  
  "Let it go, Angelo, please."
  
  "Warren, I did not want to come here in the first place, remember? You put me on this case against my wishes. Now I am involved with this disease, and I am going to do just as thorough a job with it as with any other case. Please put Carlson back on the line."
  
  Angelo could visualize Bronkowski throwing up his hands. Carlson came back, and Angelo asked, "Vince, will you please send the report to my e-mail address as soon as you're finished?"
  
  Angelo arrived at LAX on Saturday evening. He drove straight to Dorothy's. When he arrived, it was still quite light, and she was sitting in front of the house in a deck chair. When Angelo's car pulled into the driveway, she rose and ran to the car. They enfolded each other, holding the embrace for a long time.
  
  "Oof! You're crushing me," Dorothy cried finally.
  
  "I'm sorry. I am so glad to see you again. I missed you very much."
  
  Abruptly, they pushed each other to arms' length and gazed into each other's eyes. Angelo realized that there was only one future for them—a future in which they would spend the rest of their lives together.
  
  Shortly, Angelo phoned Noah. "I think maybe Dr. Barnett's theory about the origin of the epizootic is not holding up so well," he offered.
  
  "Oh?" said Noah.
  
  "I would like to come and talk with you this evening. Are you busy?"
  
  "Not at all. Do you know where I live?"
  
  "No," replied Angelo, "but I am good at following directions."
  
  What did Kraakmo find up there, Noah wondered. He'd been preparing a sandwich when Angelo phoned but now was too pent up to eat. He paced, and he tried to watch television but couldn't concentrate. Angelo and Dorothy arrived around eight. Noah invited them in and offered goblets of Chardonnay.
  
  "How nice," Dorothy said.
  
  "Marveloose," Angelo added.
  
  Finally, Noah could hold his curiosity no longer. "Dr. Kraakmo, I'm very interested in what you found in Seattle. What did you mean when you said that Dr. Barnett's theory may not be valid?"
  
  "Please, I think we know each other well enough to use first names, no?" Angelo then proceeded to detail the events of the last six months at the Seattle Zoo. He described some of the animals he had seen there, emphasizing, for Dorothy's benefit, the many different species of cats.
  
  Noah listened intently, and, when the point of the chronology became clear—the disease had originated in Seattle—Noah could only say, "My God!" over and over.
  
  "Your God," replied Angelo, "has nothing to do with it. The disease is caused by a virus related to FeLV and FIV, the common feline leukemia and feline AIDS viruses."
  
  "Then Vera was right about it being leukemia."
  
  "Partly, yes. She was in error only about the point of origin of the disease. She came to her theory based on circumstantial evidence. You have been the victim of a coincidence. Please understand that there are still some loose ends. We still don't know why the disease has such a devastating effect on the cats and why there is so much bleeding. We also do not understand how it spreads so very fast."
  
  Noah experienced an immediate pang of anger when the conversation turned to Vera. She had sold him out. She was wrong. Noah doubted they'd ever be able to mend their torn relationship.
  
  Angelo and Dorothy left around ten o'clock. Noah sat in silence for a long time, overwhelmed by Angelo's revelation. He started to sob. What the hell is wrong with me? This is terrific news. After a while, he realized that he'd been harboring a profound, suppressed guilt. Subconsciously, he had nursed a belief that he might have been responsible for the disease. Now it appeared that he was not.