Gambler Nathan Detroit has few options for the location of his big craps game. Needing $1,000 to pay a garage owner to host the game, Nathan bets Sky Masterson that Sky cannot get virtuous Sarah Brown out on a date. Despite some resistance, Sky negotiates a date with her in exchange for bringing people into her mission. Meanwhile, Nathan's longtime fiancée, Adelaide, wants him to go legit and marry her.

The just-out-of-college, effete son of a no-nonsense steamboat captain comes to visit his father whom he's not seen since he was a child.

When it comes to crime, Belgrade is same as any other modern metropolis, except for having its own serial killers. That blank is filled when a flower salesman begins strangling women. A popular, but very disturbed rock star soon becomes telepathically connected with the killer.