The corpse of Mr. Antoine Noiret, a famous oncologist, has been found in the Pond of the Devil in the forest of Chanteloube. He received a hit in the head and somebody cut his throat. Basile Tissier, a police captain of Bourges, is sent to the crime scene to lead the murder investigation with the French National Gendarmerie. At this place Basile has a vision and feels a little faint. A female doctor, Solène Durel, gives him her phone number. At night a group of artists performed a medieval spectacle: Basile Tissier goes to the castle where the artists live and the police find morphine doses that belonged to the oncologist.