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To pay for his date with Nora O'Brien, the chief of detectives' daughter, Irish-American private investigator Terry Moran pawns his revolver and borrows a weapon from his friend, tavern owner Barney Baker. Terry is forced to break his date, however, when a Mrs. Hamilton hires him to investigate the recent death of her husband, which the police have deemed a suicide, but which she suspects was really murder. When Mrs. Hamilton receives a note directing her to go to the Black Swan Club to receive information about her husband's death, Terry agrees to meet her there. Gus, the sinister head waiter at the café, escorts Terry into the office of Rockwell, the owner of the club, and Rockwell and his henchmen confiscate Terry's gun. While Terry is in the office, Mrs. Hamilton is handed a note from Nick, a waiter, asking her to meet him at a shabby hotel. Terry and Mrs. Hamilton then proceed to the hotel, where they find the waiter's dead body. After an unidentified man knocks Terry unconscious, Mrs. Hamilton flees. Chief O'Brien decides to arrest Terry because the gun used to kill the waiter was traced to him. Nora, however, convinces her father that Terry is innocent. Continuing the investigation, Nora and Terry go to Mrs. Hamilton's home, where her butler informs them that his employer has left town and hands Terry a note from Mrs. Hamilton, asking him to drop the case. Terry and Nora then visit the Hamilton Fur Company, which was owned by Mrs. Hamilton's deceased husband. There they discover an invoice for a large quantity of liquor to be delivered to Hamilton, but when they check the boxes that allegedly contain the liquor, they find them filled with stolen furs. Returning to the Black Swan Club, Terry forces his way into Rockwell's office and finds him shot to death, holding Mrs. Hamilton's handkerchief in his hand. Nora, meanwhile, goes to the Hamilton house, where Gus locks her in a room with Mrs. Hamilton. When O'Brien and his officers arrive to free them, they discover that Terry, with Barney's help, has captured Gus and his henchmen. Terry then explains to O'Brien that Rockwell and Hamilton were partners in a stolen fur racket. Rockwell knew that Hamilton and one of his men were trying to double-cross him, so he killed Hamilton. The real double-crosser was Gus, however, who arranged to have the waiter contact Mrs. Hamilton in order to expose Rockwell. After Rockwell found out about Gus's plan, he killed the waiter in the hotel. Realizing that Rockwell had discovered his dastardly deeds, Gus killed him and then planted Mrs. Hamilton's handkerchief in Rockwell's hand in order to throw suspicion on her.