Set in France during the Middle Ages, Philippe 'The Mouse' Gaston, a convicted pickpocket escapes from a castle dungeon only to get involved in a bitter feud between the powerful, scheming Bishop of Aquila and two lovers, a former captain of the guard named Etienne of Navarre and a lady named Isabeau d'Anjou, who were cursed with dark magic when the Bishop, who also fancies Isabeau, finds out of their union.  The spell transforms the knight into a wolf by night, and the lady into hawk by day, and they can only see each other briefly in human form at dawn or dusk.