

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.
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Cast

Jean Lefebvre
Eugène Ballanchon, scientific researcher, single

Maria Latour
Régine, Mr. Beauchard's spy

Bernard Blier
Mr. Beauchard, executive secretary linked to a gang

Michel Serrault
Mr. Granger, director of the scientific laboratory

Pierre Tornade
DST inspector

Pierre Brasseur
Father Ballanchon

Margo Lion
Mrs. Ballanchon, Eugène's mother

Robert Dalban
Merchant, spy in the laboratory

Mario David
Mario

Henri Virlogeux
Scholar

André Chaumeau
Baron

Jean Franval
DST inspector
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