1774, some years before the French Revolution, somewhere between Potsdam and Berlin… Madame de Dumeval, the Duke of Tesis and the Duke of Wand, libertines expelled from the Puritan court of Louis XVI, seek the support of the legendary Duke of Walchen, a seductive freethinker of German libertarianism, the Enlightenment philosophy based on the rejection of morality and authority, but also, and above all, a safe place to continue with their perverse games.