A man must protect his family. Even from himself. The year is 1911. The place is Vimy Ridge. Andre du Monde, a horror director from Paris, is making his first film, a spectacular set in the French Revolution, based on Shakespeare's Macbeth and featuring a real, working guillotine. His friends hope this summer will cure Andre of a curious delusion, that his young wife, a girl from the country, means to poison him. He is terrified of her, and she of him. They're both right. Sabine is a sorciere, a practitioner of folk witchcraft. Andre is deeply disturbed, dangerous to himself and probably others. Alexander von Reisden, doctor to the mad and Andre's friend, has to help them both - or he will lose his son, his work, and life itself.