Employed in a beauty salon, Amédée must undergo a pentothal injection. The dose is too strong; suddenly Amédée reveals the truth to everyone; to clients of the institute; to his cheating wife; to his boss that he robs; to the tax collector; etc. When the effects of the truth serum wear off, everyone returns contentedly to their little swamp.

Mr. Placard, impresario of shock, lost the headliner of his show, Elia Tarti. Amédée introduces himself, he can highlight his gifts of fantasy. Randomly along the way, Amédée notices a seductive hitchhiker named Cigale. This one disappears again, kidnapped by Prince Kanaga. Assisted by a friend, Amédée flies in his footsteps and discovers in Nice that Cigale is none other than Elia Tari, capricious, disdainful and snobbish star.