DS Sean Stone (Reece Shearsmith, The League of Gentlemen) doesn't understand people, but he knows how they work. The socially inept genius has an uncanny ability to predict human behavior. Transferred to the Missing Persons Bureau after publicly criticizing the Metropolitan Police, Stone and analyst Ruth Hattersley (Alex Kingston, ER, Doctor Who), an empathetic people person, must somehow work together when the case of a missing runaway leads to something far more deadly. 4 episodes, 3 hrs, 1 DVD, SDH.