After dusk. G." Holmes decides that it is time to reconnoitre Mrs. Warren's neighbourhood. Just then, Mrs. Warren arrives complaining that her husband was kidnapped that morning and taken by cab to Hampstead Heath where he was unceremoniously cast onto the roadway. He never got a clear look at his kidnappers or their cab. Holmes realizes that the ruffians mistook Mr. Warren for the lodger, and dumped him after they realized their mistake. Holmes and Watson go to Mrs. Warren's house just before lunchtime, hoping to catch a glimpse of the lodger as he takes his lunch from the chair. Before going in, Holmes observes that the lodger's window commands a good view down Howe Street, and at the other end is a house matching the one mentioned in the agony column. In Mrs. Warren's house, Holmes and Watson hide in a boxroom. By using a mirror they see the lodger retrieve the lunch tray from the hall, discovering that the lodger is a comely-featured young woman with a dark complexion. They realize that she has been carefully printing (rather than writing in common handwriting) her requests to hide her gender. It is equally clear that she and her bearded confederate, likely a lover or husband, are in some kind of danger and seeking refuge. From the lodger's horror at suspecting a trick at lunchtime, and the exceptional precautions that have been taken to ensure secrecy, it must be a matter of life and death. That evening, Holmes and Watson are on hand to see the lodger's confederate's lantern-signals, sent by a waving candle. The first message says "Attenta, attenta, attenta!" (Beware, beware, beware!). It becomes clear that they are Italian, and from the "-a" ending that the message is meant for a woman. The signaller then flashes "Pericolo" ("Danger") and then "Peri-". Realizing that the signaller has been interrupted, Holmes and Watson rush to the house and are surprised to meet Inspector Gregson and a Pinkerton detective from the United States named Leverton (described by Holmes as "the hero of the Long Island cave mystery"). They are lying in wait for Giuseppe Gorgiano, a vicious killer of whose infamy Holmes is well aware. The house has only one door and they know that he is inside. Gregson and Leverton have been unaware of the signalled messages.