During WWI pretty German master spy Helene von Lorbeer is sent undercover to London to live with the family of a high-placed British official where she is to rendezvous with the butler Valdar, also a spy, and help him transmit secret war plans back to Germany.
Boris Karloff
as Valdar
Margaret Lindsay
as Helene von Lorbeer
Bruce Lester
as Frank Bennett
Leonard Mudie
as James Yeats
Holmes Herbert
as Arthur Bennett
Austin Fairman
as George Bennett
William Bailey
as British Intelligence Agent
Louise Brien
as Miss Risdon - Bennett's Secretary
Glen Cavender
as Under Officer Pfalz
David Cavendish
as Capt. Lanark
Joe De Stefani
as German Officer
Carlos De Valdez
as Von Ritter
