Robert is a young French aristocrat whose revolutionary inclinations force him to flee his country.Eventually he is tracked down by Vicomte Ribaud, the detective villain, and put aboard The New Moon so that he can be deported back to France.
Robert thinks he has been betrayed by Marianne, who has gained her father's consent to travel on the same ship,
pretending she is in love with Captain Duval. There is a mutiny but Robert takes charge and the bond-servants come into
power.
Everyone goes ashore on the Isle of Pines and a new republic is founded which flourishes under Robert's guidance. But
Marianne, her pride hurt, at first refuses to marry Robert.
Then Vicomte Ribaud makes a final attempt to conquer the island for the King of France. He is surprised to hear from the French Commander that there has been a revolution in France, and that all aristocrats like himself must die unless they renounce their titles. While he, ever the Royalist, goes to his inevitable doom, there follows a happy reunion for Citizen Robert and Citizeness Marianne.