Who killed showgirl Mida King (Patricia Dane) in a private railway car in New York's Grand Central Station? The suspect list is plenty: Marc, the rich boy who loved her? His spurned fiancé? Her gangster ex-boyfriend Turk? in this witty and fun mystery, it is up to private eye "Rocky" Custer (Van Heflin) to piece together the puzzle of who went far enough in their anger to murder Mida. While waiting for the coroner to release the exact cause of her death, the story unfolds in a series of flashbacks to reveal a complex and intriguing web. It is anyone's guess who the murderer is, and you'll be trying to figure it out until the very end. All aboard!