Claude Brasseur as Le commissaire Servolle

Jean-Louis Trintignant as Louis Faguet

Jean-Paul Roussillon as Le juge d'instruction Dauzat

Patrice Kerbrat as Le commissaire Ensor

Éva Darlan as Solange Servolle

Béatrice Camurat as Eulalie Pierce, dite Lalie

Jean-Pierre Bernard as Jean Jousselin

Peter Bonke as Franck

Alain Claessens as Jean-Pierre, l'avocat

Greg Germain as Greg, le peintre

Jacques Giraud as Roland

Alain Lenglet as L'avocat de Faguet

Jean Le Mouël as Henri, l'ébéniste

Jean Message as Henri, le typographe

Jean Morino-Ros as Aldo

Noëlle Châtelet as La sociologue

Jacques Boudet as Le psychiatre

Roland Giraud as Benedetti

Irina Grjebina as La dame en fourrure

Serge Sauvion as Le Glohennec

Elisabeth Huppert as Sylvia Faguet

Jean Carmet as Kreps

Luc Delhumeau as Le brigadier

Guy Di Rigo as Le peintre

Gérard Uzès as L'inspecteur

Bernard Waver as L'avocat de Kreps

Nella Barbier as La troisième victime (uncredited)

Georges Conchon as Le médecin (uncredited)

Grégoire Gromoff as Le chauffeur (uncredited)

Paula Warner as La première victime (uncredited)