In the autumn of 1975, several brutal murders of young women occur in the small town of Poitou Charante in southwestern France, and dead crows are found next to their bodies. All the victims were brunettes, but the police do not believe in the version of a serial killer, and the investigation is stalled. Meanwhile, panic is growing in the city, all brunettes urgently repainted in blondes. Anne Ketal and her partner Mathias take on the investigation.