The Carletons make a living as card sharks and finding new suckers to mooch off of. When their latest scam backfires, they are asked to leave Monte Carlo. At the train station, they meet Miss Fortune, a very wealthy but lonely elderly lady. As a reward for saving her life after the train derails, Miss Fortune invites the Carletons to come live with her. The family hopes that by winning her affection, they can eventually be named sole beneficiaries in her will. But will a change of heart soften their mercenary feelings before that time comes?
