MORE THAN 20 MILLION COPIES SOLD WORLDWIDE • The tenth thrilling installment in Lars Kepler's bestselling series—"dark, disturbing, and chillingly relentless” (Brad Thor, #1 New York Times bestselling author)—is a tense and terrifying descent into the nightmarish mind of a killer.

An emergency call comes in the middle of the night. There is an ongoing burglary at a closed campsite in Bredäng, outside Stockholm. When the police respond to the call, they notice a light in one of the farthest RVs in the otherwise dark area, where the officers are greeted by a horrific sight. The floors, walls, and furniture are completely covered in blood. A person has been killed with an axe and brutally dismembered. In one of the rooms, a young man is sleeping on the floor with a severed arm as his pillow. He is arrested and taken into custody at Kronoberg prison. There, he is identified as seventeen-year-old Hugo Sand, the son of a famous author.

Hugo is suffering from a rare kind of somnambulism, triggered by nightmares. He is either the perpetrator or a witness, but claims that he remembers nothing from that night. When Detective Joona Linna is asked to take on the case, he contacts his old friend Erik Marie Bark, practicioner of hypnosis, in the quest to find out what happened inside the RV. What follows is a complicated hunt for a terrifying killer who has just entered an extremely active phase ...