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
as Sir Everard Dominey / Baron Leopold von Ragostein
Valerie Hobson
as Eleanor Dominey
Wera Engels
as Princess Stephanie Elderstrom
Murray Kinnell
as Seaman
Henry Mollison
as Eddie Pelham
Esther Dale
as Mrs. Unthank
Brandon Hurst
as Middleton
Ivan F. Simpson
as Dr. Harrison
Spring Byington
as Duchess Caroline
Lumsden Hare
as Duke Henry
Charles Waldron
as Sir Ivan Brunn
Leonard Mudie
as Mangan
