Laura Bruce is married to John Bruce, police commissioner. She discovers her husband is enjoying a drunken revel with another woman, and vows she will obtain a divorce. After doing so she weds Paul Ramsey. His employer, Dick Turner, a libertine, offers his a responsible position in the west, and she faces a long separation. Ramsey later learns that Turner is interested in his wife and engages a man to protect her, who happens to be her former husband. She finds this out, but does not know he is bent on vengeance. She is inveigled to go to Turner's apartment, where she meets Turner's former "flame." One of them leaves the apartment which is "Room 13." Returning from the West, Ramsey is taken to an adjoining room by Bruce, and listens to a conversation in "Room 13" between a man and a woman. He is convinced it is his wife's voice. Maddened he rushes to the room and batters down the door. He confronts Turner and shoots him.