For several months, the residents of the French province of Gevaudan have been terrified by monstrous attacks of a mysterious beast. The guests of the beautiful Countess Christina de Barjac, who visited her castle, are also frightened. But did he attack the countess’s guests, or is there an insidious conspiracy brewing within the walls of the castle? The struggle for the hand of the countess, the pursuit of the monster, general horror and all-consuming passion - everything was mixed up in a series of events. But the eccentric countess, in the presence of witnesses, swears an oath that she will give her hand and heart to the one who defeats the Gevaudan beast. But where will this promise lead her?..