October 2015. French customs seize seven tonnes of cannabis in the heart of the capital. The same day, a former narcotics infiltrator, Hubert Antoine, contacted Stéphane Vilner, a young journalist at Liberation. He claims to be able to demonstrate the existence of state trafficking led by Jacques Billard, a high-ranking French police officer. At first suspicious, Stéphane ends up plunging into an investigation that will lead him to the darkest corners of the Republic.