Tension
Police Lieutenant Collier Bonnabel (Barry Sullivan) of the homicide department explains that he only knows one way to solve a case: by applying pressure to all the suspects, playing on their strengths and weaknesses, until one of them snaps under the tension. He then cites a murder case involving Warren Quimby (Richard Basehart).
In flashback, the bespectacled Quimby, night manager of the 24-hour "Coast-to-Coast" drugstore in Culver City, is married to the sluttish Claire (Audrey Totter). Saving and doing without, he is able to afford a nice house in the suburbs, but she is utterly unimpressed, refusing even to look inside. She eventually leaves him for the latest of her conquests, rich Barney Deager (Lloyd Gough). Quimby goes to Deager's Malibu beachfront house to try to get his wife back, but she wants nothing to do with him. When Quimby persists, Deager beats him up.
He tells his sympathetic employee, Freddie, what happened. Freddie remarks that if it had been him, he would have killed the man. Deeply humiliated, Quimby takes up Freddie's idea. He constructs a new identity, cosmetics salesman "Paul Sothern," buys contact lenses and flashier clothes, and rents an apartment in Westwood. As he is moving in, he meets his new neighbor, beautiful, sweet Mary Chanler (Cyd Charisse), whom he starts dating.
One night Quimby, identifying himself as Paul Sothern, makes a phone call, leaving a message with Narco (Tito Renaldo), Deager's servant, that he will get Deager for some unspecified wrong. On a later night, he hitchhikes to Deager's place, grabs a barbecue prong and walks through the open patio door. He finds Deager asleep in a chair, but cannot go through with the killing. When he drops his weapon, Deager awakes. Quimby grabs the prong and holds it to Deager's neck, explaining that he came to kill him, but has suddenly realized that Claire is not worth it. Then, seeing that his wife is absent, he mocks Deager, guessing that Claire has said she was going to the movies—the excuse she used while cheating on him. After Quimby leaves, Deager ponders his situation.
Claire later surprises Quimby by returning to him in their Culver City apartment. When he refuses to believe she has come back out of love, she tells him Deager has been murdered. Before Quimby has time to absorb the news, Bonnabel and his partner, Lieutenant Gonsales (William Conrad), arrive to question them. They know that Claire left the murder scene before they were called. She says that she only went to Deager's place as a day guest to swim regularly, and that she and her husband were Deager's friends. Quimby is forced to play along to avoid suspicion. The police are looking for Paul Sothern, the prime suspect. However, following his stated policy, Bonnabel leads Claire on, pretending he is attracted to her.
The police get a break when Mary goes to the Bureau of Missing Persons, concerned about Sothern's disappearance. She brings a photograph. Bonnabel eventually realizes Sothern and Quimby are the same man. However, Deager was shot, and they do not have the gun. Bonnabel maneuvers Mary to Quimby's workplace to identify him, but she refuses to do so, and states that her faith in Sothern is unshaken.
The police arrest Quimby anyway. Under questioning, he tells them his story, but they find it hard to believe. Later, Bonnabel tells Claire that they had to release her husband due to insufficient evidence; he plants the idea that the gun is the vital clue they need to convict Quimby. Claire retrieves the gun from its hiding place under a rock, and plants it in Sothern's apartment. Quimby arrives, followed very shortly by the police. Claire claims she was searching for the gun, and Bonnabel encourages her to continue; she "finds" it under a chair cushion, but then Bonnabel explains that all the furnishings had been replaced, and that Claire has just incriminated herself. Claire is resigned to her fate, but defiantly walks out in the custody of Gonsales. Mary protests that nothing in the apartment has been changed; Bonnabel replies that it would have been too much work. Quimby and Mary are free to resume their relationship.
revenge, suspenseful, murder