Six months before his retirement from the criminal police, inspector Joss finds his colleague Gouvion dead, in a poorly faked suicide attempt. Joss loses his temper, and investigates on his own, which leads him through the bas-fond of Paris...
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.
Boris Zaroff is a modern businessman who is haunted by his past -- his father was the notorious Count Zaroff of The Most Dangerous Game fame. Consequently, Boris is subject to hallucinations and all-too-real social lapses which normally involve sadistic harm to beautiful naked young women. His butler is sworn to indoctrinating him into the evils of the family line, and their castle's torture dungeon proves quite useful in this regard. However, Boris is periodically lured away from his destiny by the romantic apparition of the deceased countess who previously owned the castle.
