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