Newlyweds Horace and Millie Jason check in to a New York hotel for their one-night honeymoon, while Horace is on twenty-four-hour leave from the Army. As Horace is out getting champagne and Millie primps in the bathroom, two thugs named Skinny and Tubby dump the body of unconscious gangster Duke Keesler in their bed. Horace and Millie are horrified when they discover Duke and run through the halls calling for the police. When house detective Pat Callahan comes to their room, however, Duke has disappeared. Horace and Millie then find Duke in Millie's trunk, and while they leave the room to retrieve Pat, Duke revives and escapes through a window. After they find the trunk empty, Pat becomes irritated by the apparently addled couple, and when Horace crawls into the trunk to demonstrate how they found Duke, Millie accidentally locks him in, and she and Pat leave to get a key. Skinny and Tubby, meanwhile, take the trunk which they believe contains Duke to their boss, notorious gangster Frankie Saxton, hoping to find some stolen money which Duke has hidden. Tubby and Skinny then go back to the hotel to search the room before Frankie releases Horace. Unaware that Frankie has mistaken him for Duke, Horace fails to comprehend his threats and escapes when someone shoots at the gangster through a window. Horace is still wearing his pajamas and is picked up by a patrolman for indecent exposure. After Horace is retrieved by Pat and Millie, Frankie almost kidnaps the couple, who escape into a movie theater. Although they try to hide in the darkness, the lights come up for a contest, and Horace has the dumb luck to hold the winning ticket for a sterling silver coffee set. Millie is kidnapped while Horace is on stage accepting the gift, but Frankie's moll, Dotty, takes him back to Frankie's apartment, where they finally determine that he is not, in fact, Duke. Frankie and his gang leave Horace and Millie bound and gagged, but when neighbors hear a radio crime drama through Frankie's walls, they call the police, who free the bewildered couple. Soon after returning to their hotel room, Horace and Millie, who have been put under Pat's protection, find Duke's dead body in their closet, and this time, he is still around when Pat comes to their room. Just as Horace finds $50,000 in the pocket of his robe, Frankie, Skinny and Tubby enter through a window, knock out Pat and take the money. Horace becomes angry when they grab Millie, and he and his wife soon get into a fistfight with the gangsters, which the gangsters lose. The gangsters are arrested, and by the time the exhausted newlyweds settle down to sleep, the phone rings with their six o'clock wake up call.