Jean Boyer (Director)
Michel Simon
Professor Charles Buisson
Brigitte Auber
Gisèle, student of Buisson
Henri Génès
Lucien Mosca, boss of Ruban Bleu
Germaine Kerjean
Mrs. Rédéri
Anne Campion
The determined trafficker
Philippe Mareuil
Pierre-Dominique, aka 'Pépé'
Robert Lombard
Maurice, Buisson's assistant
Georges Galley
Patrice
Suzanne Norbert
Mrs. Buisson
Gaby Basset
Henriette, washroom attendant
Micheline Dax
The indecisive snob
Leila Lampi
Russian Princess
Janine Clairville
Woman from Paris
Nadine Tallier
Poupette, presenter of the show
Annick Tanguy
Woman from Paris
Liane Morice
Woman from Paris
Nikitine
Woman from Paris
Liliane Montevecchi
Woman from Paris
Jacqueline Ventura
Woman from Paris
Gisèle Fréry
Woman from Paris
Nicole Rimbaud
Cloakroom attendant
Janine Caire
Florist
Bernard Lajarrige
Inspector Corbin
Robert Lamoureux
Self
Patachou
Self
Ray Ventura
Self
Jean-Marc Thibault
Self
Roger Pierre
Self
Les Quat'Jeudis
Self
Jacques Grello
Narrator
Françoise Alban
Magda, the pregnant dancer (uncredited)
Jack Ary
Cowboy (uncredited)
Danièle Delorme
Young female client of Ruban Bleu (uncredited)
Sophie Desmarets
Self (uncredited)
Sacha Distel
Self (uncredited)
Pierre Duncan
Policeman at Quai des Orfèvres (uncredited)
Bob Ingarao
Arsène the toothless (uncredited)
Dominique Marcas
Woman with stomach ache (uncredited)
Michel Seldow
Police officer (uncredited)
Henri Serre
Young customer of Ruban Bleu (uncredited)
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Professor Charles Buisson, astronomer and Nobel Prize winner, has just discovered a nova. He informs the other observatories by telephone. Just as he thinks one of them is calling back, he finds himself on the line with a young woman threatening suicide at the Ruban Bleu cabaret, if her lover hasn't joined her by midnight. Intrigued, the professor decides to go and prevent the unfortunate woman from committing suicide. One of his students, who earns her living as an understudy in a knife act, helps him in his investigation, while the school principal and a policeman suspect him of being a prankster or even of selling drugs. For the scientist, it's an opportunity to discover a world of music-hall that he'd never known before: "I thought I knew the sky chart by heart, but there's one planet that was totally unknown to me: Earth. I'll be back!
