Irma is a woman who doesn't mind people knowing she's expensive. Nick Valentine, a nightclub owner in Chicago, has fallen hard for her and proposes marriage. She accepts, but needs to give the air to another boyfriend, Mack Graham, an assistant D.A. She does, and he doesn't take it well. Meanwhile, she's playing Nick, because she still has her real boyfriend, Vincent Lynch, stashed out of sight. The next night, all of them are on the train to New York when someone is murdered. Unfortunately for the criminal, two others are also on board: NYPD Inspector Carr, and Dr. Crabtree, a criminologist. Will someone get away with murder?
