A gambler accepts a bet that he cannot win the heart of a strait-laced Salvation Army member. Meanwhile, his friend has to find a secret location for an illegal dice game he is organising - while also contending with the police, a mobster and a girlfriend desperate to drag him to the altar. Musical, starring Frank Sinatra, Marlon Brando and Jean Simmons. Songs include Luck Be a Lady Tonight and Sit Down You're Rocking the Boat.

In New York, a gambler is challenged to take a cold female missionary to Havana, but they fall for each other, and the bet has a hidden motive to finance a crap game.