When a whole family is murdered in Stockholm, Detective Inspector Joona Linna knows there is only one person who can help find the perpetrator. Erik Maria Bark, retired hypnotist, is called in to work with Josef Ek, a 15-year-old boy who witnessed the brutal murder of his family. Following a series of accusations by his patients, Erik is reluctant to return to his craft but makes an exception for Joseph Ek. As he delves deep into the boy's mind, he discovers a horrifying truth ...