A young man is found asleep at a horrific crime scene. Is he the perpetrator or just and innocent witness? Detective Joona Linna has to investigate the phenomenon of sleepwalking. However it is clear the boy cannot recall what happened so hypnosis is employed. As Hugo regresses into his nightmares, so the body count rises. Lars Kepler is the pseudonym of a writing partnership and this is another excellent Scandi-crime novel from the team. The murders are suitably gruesome and the psychology elements clearly explained. Yes, there's the gratuitous sexual perversion side-plot but it's not overplayed. All in all a very enjoyable addition to the canon

The Sleepwalker isn’t subtle. It doesn’t aim to be quiet comfort reading—it’s sleepwalking into nightmare territory; forensic terror mixed with psychological wreckage, tied up in Linna’s unstoppable drive to solve the case. The Sleepwalker is bleak, engrossing, and fascinating. Kepler leads us through horror and hypnosis, crime scenes and shattered memories. This is Scandi noir stripped bare, blood‑soaked in grief and nightmares.