Louis and August Siever, the twins sons of a German father and American mother, are traveling in Europe when war breaks out. August joins the Kaiser's army, but Louis, a supporter of the United States, is practically made a prisoner in Berlin for a year while he tries to prove his American citizenship. After a violent confrontation with Louis, August steals his brother's passport and leaves for New York with Gerda Anderson, a German spy.
| Actor | Role |
|---|---|
 Franklyn FarnumCapt. August Sieger / Louis Siever | Capt. August Sieger / Louis Siever |
 Claire Du BreyGerda Anderson | Gerda Anderson |
 Rosemary ThebyShirley Wayne | Shirley Wayne |
 Charles Hill MailesJosiah Wayne | Josiah Wayne |
 Sam De GrasseMortimer Eddington | Mortimer Eddington |
 T.D. CrittendenHenry Waltham Steele | Henry Waltham Steele |
 Fred MontagueCapt. Bernard (as Frederick Montague) | Capt. Bernard (as Frederick Montague) |