This talkative and unevenly paced feature finds Fou (Jean Lefebvre) the inventor of a gas that makes the users fall in love. He is chased by his boss, the police, and spies, who seek to secure the secret recipe for their own selfish purposes. A shadowy American underworld figure tries to intimidate the inventor. A half-hearted attempt at comedy tries to go along with the double dealing and trickery of the thin plot of the film.

• Gaumont
• Jean Lefebvre
• Maria Latour
• Bernard Blier
• Michel Serrault
• Pierre Tornade
• Pierre Brasseur
• Margo Lion
• Robert Dalban