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