Francesco Carnelutti

Dottor Lauker

Rossano Brazzi

Commissario Matthäi

Raymond Pellegrin

Capo della polizia

Macha Méril

Signora Heller

Erica Beltrami

Gisella Burinato

Signora Moser

Bruno Corazzari

L'autore

Iris Mazzucco

Marne Maitland

Von Gunthen

Gianni Pulone

Signor Moser

Diana Torrieri

Signora Schrott

Larry Dolgin

Commissario Feller (uncredited)

Giulio Albonico

Cinematography

Alberto Negrin

Director

Paolo Boccio

Editor

Gianfranco Calligarich

Writer

Friedrich Dürrenmatt

Novel

Egisto Macchi

Music