When he finds a package in the metro, given this period of restrictions, Mr. Truche thinks it may be a good deal, he takes it home but discovers a woman's head inside. A friend of Mr. Truche having just disappeared, the superintendent accuses her of having murdered her and discovers the head buried in his cellar. But the girlfriend, whom Mr. Truche loves platonically, returns from the countryside and at the same time we spot the assassin of the unknown woman.