A few minutes before killing his father and mother in cold blood, Benjamin Feller - a young 18-year-old who apparently had no prior history - sends his intimate diary via post to his French teacher, in which he explains and confesses his act. The teacher finds herself being questioned by the authorities and is soon confronted with her own doubts. What if her taste for literature that is obsessed with the sufferings of the human soul had blinded her to her student's distress and to what was hidden in the feverish prose which he had shown her well before his crime?

Five days before D-Day, the day of the last voyage of the Order of Sirius, a sect nestled in the Vaudoise Alps, Switzerland. Five days during which a community of 48 people, women, men, children, fed with esotericism and guided by a narcissistic guru, will test their faith and be deprived of their identity. Five days in which every gesture could be the last. Sirius is inspired by the massacre of the Order of the Solar Temple in 1994 in Western Switzerland.

Riyad and his friend Zaïd leave their estate near Lyon and go to Switzerland to steal two luxurious cars for the account of Chérif, the thug ruling their area. Yet the journey goes wrong. Hunted, Riyad sinks into the mountains to escape the police. The hunt continues in the heart of a lost, hostile valley, in which Riyadh desperately seeks a way to return to France.

June 1986. Mathieu, 17, miraculously survives a serial killer who has never let anyone escape. Wounded, traumatized, he tries to rebuild himself with his family. Superintendent Jotterand asks him to create a composite portrait of the killer. But Mathieu can't remember everything .