In the frigid clime of Tumba, Sweden, a gruesome triple homicide attracts the interest of Detective Inspector Joona Linna, who demands to investigate the murders. The killer is still at large, and there's only one surviving witness--the boy whose family was killed before his eyes. Whoever committed the crimes wanted this boy to die: he's suffered more than one hundred knife wounds and lapsed into a state of shock. Desperate for information, Linna sees only one option: hypnotism. He enlists Dr. Erik Maria Bark to mesmerize the boy, hoping to discover the killer through his eyes.