Possessing an uncanny insight into criminal behavior, psychologist Tony Hill (Robson Green, Grantchester) is called upon to assist the police in building profiles of serial killers in Northern England. His unorthodox methods prove to be essential in solving a series of chilling crimes. Guest stars include Siobhan Finneran (Downton Abbey), Kenny Doughty (Vera), Pip Torrens (The Crown), and John Hopkins (Midsomer Murders). 24 episodes, 35 hrs, 13 DVDs. Mature audiences.