Inspektor Higgins
Joachim Fuchsberger
Peggy Ward
Siw Mattson
Mrs. Potter
Renate Grosser
Mr. Potter
Hans Krull
Miss Finley
Ilse Pagé
Professor Bound
Edith Schneider
Bannister
Wolfgang Spier
Library Clerk
Ewa Strömberg
Casper
Jimmy Powell
Secretary
Eva Ebner
Captain
Thomas Danneberg
Sir Arthur
Hubert von Meyerinck
Sir Cecil
Wolfgang Kieling
Der Fremde
Pinkas Braun
Adela
Claude Farell
Ramiro
Peter Mosbacher
Dr. Brand
Siegfried Rauch
Mr. Merryl
Otto Stern
Sabrina
Lill Lindfors
Novel
Edgar Wallace
Screenplay
Ladislas Fodor
Director
Alfred Vohrer
Original Music Composer
Horst Wendlandt
Producer