That Most Important Thing: Love

Servais Mont, a freelance photographer who works taking compromising photos, gets fascinated by Nadine Chevalier, a tormented low-budget movie actress married to an eccentric film photo collector.

Romy Schneider

(Nadine Chevalier)

Fabio Testi

Jacques Dutronc

(Jacques Chevalier)

Claude Dauphin

Roger Blin

(Servais' Father)

Nicoletta Machiavelli

Klaus Kinski

(Karl-Heinz Zimmer)

Gabrielle Doulcet

(Madame Mazelli)

Michel Robin

(Raymond Lapade)

Guy Mairesse

(Laurent Messala)

Katia Tchenko

(Myriam, the prostitute)

Paul Bisciglia

(The Assistant Director)

Sylvain Lévignac

(The First Man in the Brewery)

Olga Valéry

(The Woman with the Dildo)

Jacques Boudet

(Robert Beninge)

Robert Dadiès

(The Doctor in the Hospital / An Actor in the Theatre)

Georges-Fréderic Dehlen

(An Actor in the Theatre)

Jack Jourdain

Claude Legros

(Manuel Rosenthal)

Kira Potonie

(Messala's wife)

Michel Such

(The Electrician)

Jacques Van Dooren

Nadia Vasil

(The Female Director)

Sin May Zao

(The Vietnamese Girl)

Gérard Zimmermann

Claudine Beccarie

(The Girl at the Orgy (uncredited))

Frédérique Barral

(Girl in the brewery (uncredited))

Michel Berreur

(The second man in the brewery (uncredited))

Guy Delorme

(Mazelli henchman (uncredited))

Jerry Di Giacomo

(The transvestite English (uncredited))

Serge Godenaire

(The youth in the orgy (uncredited))

Gérard Moisan

(Mazelli henchman (uncredited))

Manu Pluton

(The man at the gym (uncredited))

Eric Vasberg

(The third man in the brewery (uncredited))