The Winged Mystery

Louis and August Siever, twin sons of a German father and American mother, are traveling through Europe when war breaks out. August joins the Kaiser's army, while Louis, a loyal American, is trapped in Berlin for a year while he tries to prove his citizenship. After a violent confrontation with Louis, August steals his brother's passport and leaves for New York City with Gerda Anderson, a German spy. Louis also returns to the U.S., and sometime later is invited to a weekend party on Long Island by his wealthy friends, the Waynes. When August and Gerda learn of the event, they rent a nearby house and invite all of the Waynes' guests, including Louis, to a "mystery" party. Upon their arrival, the women are held prisoner and ransom notes are sent to their husbands via carrier pigeon. Shirley Wayne and Louis track down and are captured by the kidnappers. Meanwhile, Mortimer Eddington, an amateur detective, devises a method to trace the pigeons back to the house. Before Shirley and Louis come to harm, police officers arrive and demand the Germans' surrender.