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During World War I, John Stevens invents an anti-submarine device, but the plans are stolen by two German spies, the Baron von Wiederholtz and Madame Elsa, who flee to a New York hotel. Stevens' daughter Alice pursues the spies hoping to retrieve the plans.
as Alice Stevens
as Howard Skeele
as John Stevens
as Baron Kuno Von Wiederholtz
as Madame Elsa
as Richard Skeele
as George Worth
as Margaret Worth
as French Maid
as House Detective