"During the Tour de France, five riders are found murdered with a red tulip near their bodies. A journalist and a police inspector lead the investigation to unmask the murderer."
René Dary
as Pierre Lusanne
Suzanne Dehelly
as Colonelle
Raymond Bussières
as Albert 'La Puce' Jacquin
Pierre-Louis
as Charolles
Robert Berri
as Jacques Mauval
Robert Le Fort
as Basile
Emilio Carrer
as Gambarra
Robert Blome
as Jef Dooksen
René Robert
as
Luc Andrieux
as Charles Brugeat
Roger Bontemps
as Reporter
Marian
Jean-Jacques Lécot
Claude Larry
Bob d'Arcy
Jean Debray
as Cooper
Jean Nosserot
as Fuseau
Émile Genevois
as Robert
Coussolle
Orgaert
Marcel Loche
René Hell
Edith Guarini
Annette Poivre
as Annette Jacquin
Jean Brochard
as Chief Inspector Honoré Ricul
Albert Broquin
as Mechanic (uncredited)
Maguy Horiot
as (uncredited)
Frédéric Mariotti
as Police inspector (uncredited)
Jacques Mattler
as Director of the judicial police (uncredited)
Fernand Mithouard
as Max Everkampf (uncredited)
Marcelle Rexiane
as Cashier (uncredited)
René Stern
as Maître d'hôtel (uncredited)
Jean Stelli
Director