Corporal Blake is sent to apprehend the murderer of François Breault. All evidence points to Jan Thoreau as the guilty man. Blake arrives at Thoreau's cabin while he is away and is greeted by his wife Marie. Posing as a friend of her husband, Blake learns that Thoreau and Breault had quarreled shortly before the murder. This, together with Breault's dying accusation that Thoreau was his murderer, seems undeniable evidence. Blake, fascinated by Marie, agrees to let Thoreau escape, providing that she become his mistress. After much anguish, she consents. When Thoreau arrives, Blake arrests him but during the night Marie helps him escape. Blake goes in pursuit.