In the 15th Century, two travelling musicians named Gilles and Dominique arrive at the castle of Baron Hugues, amid celebrations for the impending marriage between Hugues' daughter Anne and a knight Renaud. The two musicians are in truth emissaries of the Devil, sent to disrupt the wedding for their own amusement. Whilst Dominque seduces Renaud, Gilles makes an easy conquest of Anne. However, Anne's purity overwhelms Gilles and he in turn falls in love with her. This unexpected turn of events forces the Devil into making a personal appearance.