A rich man bequeaths seven keys to seven of his friends, but only one will unlock the door to untold wealth.
Heinz Drache
as Inspector Dick Martin
Eddi Arent
as Assistant Detective Holmes
Sabine Sesselmann
as Sybil Lansdown
Pinkas Braun
as Dr. Antonio Staletti
Hans Nielsen
as Lawyer Warren D. Haveloc
Gisela Uhlen
as Emily Cody
Werner Peters
as Bertram Cody
Klaus Kinski
as Pheeny
Siegfried Schürenberg
as Sir John
Jan Hendriks
as Tom Cawler
Ady Berber
as Giacco
Friedrich Joloff
as Janitor Burt
