Clement Mastard is the head of a leading journal dedicated to extravagant vaudeville. An unexpected contract requires him to reconnect with his former headliner Celia Bergson part to try to avant-garde theater. It is through this that he met Johann Sebastian Bloch, misunderstood musician who cause the loss but the side which Mastard, the man without scruples, to humanize and eventually produce a real masterpiece, the Missa Solemnis
Jean Yanne
as Clément Mastard
Robert Hirsch
as Jean-Sébastien Bloch
Catherine Rouvel
as Célia Bergson
Liliane Montevecchi
as Gigi Nietzsche
Denise Gence
as Anna-Magdalena
Ginette Leclerc
as L'habilleuse
Hubert Deschamps
as Taffarel
Georges Beller
as Pommier
Paul Le Person
as Armand Boussenard
François Darbon
as Baptiste
Guy Grosso
as Frère Boussenard
Claude Evrard
as Chrétien Boussenard
