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 fifteen-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 that Josef murdered his own family on the orders of his sister Evelyn. When Joona and Erik journey deep into the woods to find Evelyn, she admits that she was abused by her brother for many years. When she refused to submit to him, he took revenge on the entire family. When Josef escapes from custody and Erik's only son Benjamin disappears from the family home, Erik is thrust into a world of violence and gang warfare, forcing him to revisit his past to discover the truth.