Mary Grant has a gambling father and a mother who has disappeared. Even though she has been raised in a convent she proves true to her ancestry by running away to Monte Carlo and spending her small inheritance at the gambling table.
Young Annesley Grayle, weary of a gloomy, uneventful existence with her aunt, accepts the proposal of a young American that she pose as his wife. Later, they are actually married. When, at a ball, she hears her husband accused of stealing a valuable diamond and realizes that he is indeed a thief, she hides the jewel to save him.
Peter is smitten with Winifred, a model, whom he met on board the steamer returning from Europe, but is discouraged by his sister, Ena, who is more ambitious for him. Peter is the son of Peter Rolls, the wealthy New Yorker. Ena tells Winifred that Peter is engaged to Eileen, sister of Lord Ravglan and that he is just trifling with her.
