 After leaving his lover Angel McGinnis behind in London, rich playboy Barney Lincoln breaks into a playing card manufacturer in Geneva to mark the cards and then break the bank at every European casino.Barney meets up with Angel again in Monte Carlo, where he wins a great deal of money.But her suspicions after he left England caused her to consult her father, a detective from Scotland Yard, who forces Barney to help him catch a smuggler named Harry Dominion who has a weakness for gambling.