An English teacher seduces a young student in the company of his wife to help him in an ambitious plan with the kidnapping of a newborn baby of a wealthy businessman.

In the early 1950s, the popular radio show "La Kermesse aux Étoiles", hosted by the famous Jean Nohain, mixing lottery games and performances of various artists, will be disrupted by the adventures of a man and his fiancée seeking to recover a dangerous bottle of perfume (explosive) which was unfortunately mixed with the prizes to be won ...