At a crowded cafe, Brad Martinelli pulls a switchblade on Danny Logan for dancing with Sue Randall. The fight is broken up by Brad's gangster brother who administers a private beating to Danny. When Sue's father forbids Danny to see her, they run off to Vegas and get married. The newlyweds return home to far worse than angry parents. Brad gets hopped-up on heroin and stalks the young lovers, armed, vowing that no one but he will ever possess Sue.