The Lone Wolf in London

When the priceless diamonds known as the Eyes of the Nile are stolen in London, Inspector Garvey of Scotland Yard immediately suspects Michael Lanyard, the reformed jewel thief known as "The Lone Wolf." Lanyard vehemently denies the inspector's accusation, claiming that he is merely writing a book on the jewels and was in New York at the time of the theft. After his meeting with the inspector, Lanyard joins his butler, Claudius Jamison, at their rented rooms. Both Lanyard and Jamison are experiencing financial difficulties and consequently, when Ann Kelmscott, the daughter of famed gem collector and wealthy English gentleman Sir John Kelmscott, invites them to the family estate, the pair are intrigued. At the Kelmscott house, Sir John confides that he is in desperate need of a large sum of money and asks Lanyard to arrange a confidential loan using part of his jewel collection as collateral. After leaving the house, Jamison tells Lanyard that he has learned from Lily, the maid, that Henry Robards, the family's butler, is heartbroken because his former wife, actress Iris Chatham, left him for Monty Beresford, a man who suddenly came into a considerable fortune. Jamison continues that Lily told him that Monty financed the lavish stage production that launched Iris to stardom. Upon returning home, Lanyard receives a call from Iris, inviting him to the theater that night. After her performance, Iris asks Lanyard to stay away from the Kelmscott house and then bids him goodnight. As she reaches her apartment, Robards steps from the shadows, begging for a reconciliation, to which Iris disdainfully replies that he first must accede to her demands. Piqued by Iris' interest, Lanyard decides to accept Kelmscott's offer and arranges to meet gem dealer Bruce Tang the next morning. The following day, Kelmscott gives Robards a packet of jewels to deliver to Lanyard. Before leaving the house, Robards, following Iris' instructions, rifles the safe and removes the Eyes of the Nile diamonds. As Robards is about to drive to town, David Woolerton, Ann's fiancé, asks him for a ride. Along the way, Woolerton, who suspects that Lanyard is scheming to steal the Kelmscott jewels, insists upon accompanying Robards to meet Lanyard. At Tang's shop, Garvey, who has had Lanyard under observation, is awaiting his arrival when Robards' car rolls up onto the sidewalk, the butler slumped dead behind the wheel. Although the jewels to be pawned are still in Robard's possession, the case containing the diamonds is empty. Woolerton then appears and after claiming that Robards pushed him out of the car on the outskirts of town, charges Lanyard with murder. After calmly deducing that Kelmscott was being blackmailed by the thief who sold him the diamonds, Lanyard flees from the police and the irate Woolerton and proceeds to Iris' apartment. There, Iris has just persuaded Monty to steal the diamonds from Lanyard. After Iris leaves, Lanyard enters and Monty demands that he hand over the jewels. Lanyard then overpowers Monty and ties him up, leading him to believe that he plans to run away with Iris. Hurrying to the theater, Lanyard searches Iris' dressing room and discovers the diamonds sewn into the sleeve of her mink coat. When Iris enters the room and admits that Robards gave her the diamonds, Lanyard leaves the room to phone Jamison. Iris then sneaks out an open window and speeds to the airport to catch a flight out of the country. There, she is met by Lanyard, who turns her over to the waiting Garvey. Monty, who has been freed by the chambermaid, then bursts in and blurts out that Iris planned the entire robbery and then killed Robards after he turned the diamonds over to her. When Iris denies Monty's allegations, Lily, dressed in Iris' mink, waltzes into the airport, escorted by Jamison. Taking the coat from Lily, Lanyard extracts the diamonds, thus proving Monty's charges.