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.

• 
  Andrzej Żuławski
• 
  Élisabeth Rappeneau
• 
  Laurent Ferrier

• 
  Romy Schneider
  Nadine Chevalier
• 
  Fabio Testi
  Servais Mont
• 
  Jacques Dutronc
  Jacques Chevalier
• 
  Claude Dauphin
  Mazelli
• 
  Roger Blin
  Servais' Father
• 
  Nicoletta Machiavelli
  Luce Lapade
• 
  Klaus Kinski
  Karl-Heinz Zimmer
• 
  Gabrielle Doulcet
  Madame Mazelli
• 
  Michel Robin
  Raymond Lapade
• 
  Guy Mairesse
  Laurent Messala
• 
  Katia Tchenko
  Myriam, prostitute
• 
  Paul Bisciglia
  Assistant Director
• 
  Sylvain Lévignac
  First Man in the Brewery
• 
  Olga Valéry
  Woman with the Dildo
• 
  Jacques Boudet
  Robert Beninge
• 
  Robert Dadiès
  Doctor in the Hospital / Actor in the Theatre
• 
  Georges-Fréderic Dehlen
  Actor in the Theatre
• 
  Jack Jourdain
  Victor
• 
  Claude Legros
  Manuel Rosenthal
• 
  Kira Potonie
  Messala's wife