Cast
Frank Finlay
Commissaris Simon "Piet" van der Valk
Françoise Arnoul
Solange de Winter
Oskar Homolka
Hoofdcommissaris Samson
Françoise Prévost
Arlette van der Valk
Cyd Hayman
Lucienne Englebert
Werner Finck
Mankiewicz
Pierre Vaneck
Stam
Hans Járay
Englebert
Günter Lamprecht
Bernard Neefs
Hansjörg Felmy
(voice) (uncredited)