Antoine Saint-Just, comrade of Robespierre and youngest member of the Committee of Public Safety, is drawn into the tempestuous political & military conflicts of France under the Terror.

An American traveling in Europe suddenly disappears, and his daughter, married to an eminent scientist, receives a letter asking her to go to Antwerp, which she does with her young son. Both are about to disappear. OSS 117 is asked by his superiors to solve these mysterious disappearances.

The crew of an aircraft carrier discovers that it is being pursued by a UFO that turns out to be a radioactive probe from outer space. They appeal to the warring countries of Earth to stop fighting and help it to repel the invaders.

The whole clique of Cruchot's police station is retired. Now he lives with his rich wife in her castle - and is bored almost to death. He fights with the butler, because he isn't even allowed to do the simple works. But when one of the clique suffers from amnesia after an accident, all of the others reunite and kidnap him, to take him on a tour to their old working places and through their memories. In their old uniforms they turn St. Tropez upside down.