Gunshots resound in the mountains: the valley of Lusagne is preparing to welcome the wolf hunt. While the village is busy preparing for the event, mysterious human bones are found in a cave. William Delapierre, a young man with no family or attachment, was coldly shot in the skull and abandoned in the mountains. Alex Hugo is convinced that the case conceals a mystery more complex than a simple settlement of accounts. The discovery of a wild teenager, lost in the forest, will prove him right. Then begins a long hunt to discover the dreadful truth.

Alex Hugo is not satisfied with the official version of Lisa Leblanc's death. True, the young woman crashed on the ground following a bungee jump that went wrong but she might have been pushed to kill herself. Moreover, the existence of a film that shows the drama in all its details seems to indicate that someone knew what was going to happen. Alex discovers that a similar accident has grieving the coves of Marseille a few weeks earlier. With Caroline Wacquier, he relaunched the investigation. For his part, Angelo has some problems with his nephew, who has bad dating...