James Mordon, a reformed cracksman, is in the employ of Henry Penrose, as chauffeur. The latter receives a letter from a probation officer informing him of his employees having served time in prison. He decides to discharge the young man but is persuaded by his wife to give him a chance. Alma, his wife, has had a previous love affair with Herbert Manning, an unscrupulous fellow, who lives by his wits. She writes him asking him to destroy all of her letters and in reply he writes her that he is in need of money and makes an appointment with her at 10 o'clock that night. When they meet words lead to an argument and a struggle ensues. James Mordon, the chauffeur, sees them and goes to her assistance. He learns what the dispute is about and decides that he will steal his mistress' letters from her former sweetheart, who has failed to keep his agreement. He breaks into the latter's apartment and is caught. In endeavoring to get away he is shot and killed. The next morning Mrs. Penrose reads the note the chauffeur has left her, in which he told her that he was going to commit his last robbery and secure the letters. At the same time, the husband reads of the killing of Mordon, the newspaper account veiling the tragedy as a mystery.