Steve is framed for charges of treason by Nazi spies and Wonder Woman finds herself in trouble when she loses her magic lasso while trying to rescue him.
Wonder Woman's sister Drusilla is sent from Paradise Island to Washington to tell Diana to come home. Drusilla discovers her own alter ego, Wonder Girl, and is kidnapped by the Nazis.
Drusilla accidentally reveals the location of Paradise Island to the Nazis who want to go there to harvest Feminum. Wonder Woman must return home to protect her people.
A scientist develops a method of making earthquakes. Later a German spy steals his work. Steve tries to find out what he is going to do with it. But they also find out he's infected with bubonic plague.