When her husband goes off to fight during World War I, a pregnant woman is left on her French farm to care for the animals, with only the help of an elderly farmhand and a mysterious 12-year-old boy. There is also a mare which is about to foal. When tragedy strikes, the woman becomes obsessed with the newborn horse. A local priest suggests she's insane, and the boy thinks the foal is evil. Perhaps they are both right. A decade later, in a Paris apartment, the farmhand tells a young journalist the story about what really happened on that farm.