
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
Pierre Lusanne
Suzanne Dehelly
Colonelle

Raymond Bussières
Albert 'La Puce' Jacquin

Pierre-Louis
Charolles

Robert Berri
Jacques Mauval

Robert Le Fort
Basile
Emilio Carrer
Gambarra

Robert Blome
Jef Dooksen
René Robert
Luc Andrieux
Charles Brugeat
Roger Bontemps
Reporter
Marian

Jean-Jacques Lécot
Claude Larry
Bob d'Arcy