Inconsiderate millionaire John Benson, philanthropist Oliver North, courageous Langdon Crane, wealthy idler Robert Curtis and Lydia Benson are among the passengers on an ocean liner that is sunk by a German submarine. Carried away by the currents to a tropical island, the castaways endure hardships which bring out their true natures. Benson becomes kind and considerate underneath his gruff exterior, North exhibits a meanness and smallness, Crane turns into a coward and slacker when he is confronted by hard work and Curtis develops into a dynamo of activity whose strength and consideration prompts Lydia to fall in love with him. Finally, they are rescued and all return home where Lydia and Curtis are married.