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.
Pierre Lusanne
Colonelle
Albert 'La Puce' Jacquin
Charolles
Jacques Mauval
Basile
Gambarra
Jef Dooksen
Charles Brugeat
Reporter
Cooper
Fuseau
Robert
Annette Jacquin
Chief Inspector Honoré Ricul
Mechanic (uncredited)
(uncredited)
Police inspector (uncredited)
Director of the judicial police (uncredited)
Max Everkampf (uncredited)
Cashier (uncredited)
Maître d'hôtel (uncredited)