Cast and credits of Der Schlüssel

Peter Pasetti
Generaldirektor Werner Vilessen

Gisela Uhlen
Ruth Vilessen

Günther Schramm
Alfred Vilessen

Grit Boettcher
Maria (as Grit Böttcher)

Karl John
Herbert Mansfeld

Eva Pflug
Frau Mansfeld

Hans Cossy
Herr Maraun

Olga von Togni
Helga Maraun

Fritz Schmiedel
Dr. Wilmers

Wolf Rahtjen
Kriminalassistent Wagner (as Wolf Rathjen)

René Deltgen
Kriminalinspektor Bracht

Reinhard Glemnitz
Narrator (voice) (uncredited)