A young woman is found dead in a forest. Her body is partially burned and it seems that strange rituals were performed at the crime scene. Disturbing detail: she gave birth just hours before her death and the baby's whereabouts are unknown. Astrid and Raphaëlle find themselves on the trail of a feminist association: Circé. Was this young woman killed because of her commitment? Is the murder related to an obscure practice of witchcraft or to the baby she was carrying?