The film is a 125-minute, black-and-white biography of French priest and diplomat Charles Maurice de Talleyrand-Périgord (1754–1838), who served for 50 years under five different French regimes: the Absolute Monarchy, the Revolution, the Consulate, the Empire, and the Constitutional Monarchy. Its title comes from one of the main historical nicknames for Talleyrand, that he shares with demon king Asmodeus and English poet Lord Byron.

Val Brosse, a private detective, receives Françoise, who confesses to him that she murdered her husband. The story is false, but Val, intrigued, decides to investigate.

In a French girls' boarding school, things are going haywire. The new professor is seduced by the lusty students and the teacher turns out to be a dominatrix who wants to show the girls the right way. The shameless goings-on do not remain without consequences, Monique and Julie should leave the sinful institute, but the two precocious girls decide to work in a Parisian brothel after school to pay the school fees...

A country priest receives his bishop with the mission of converting a nudist camp.