The second of the three film versions of the E. Phillips Oppenheim espionage thriller set largely in an old dark house where a tremulous wife wonders if her husband is really his double, a dastardly German spy.

• Edmund Lowe
• Valerie Hobson
• Wera Engels
• Murray Kinnell
• Henry Mollison
• Esther Dale
• Brandon Hurst
• Ivan F. Simpson