The real-life story of the police pursuit of a notorious serial rapist whose 17-year reign of terror left thousands of elderly people in south east London living in fear. It is based on the diaries of Colin Sutton and is an important case that he became involved in just before his retirement from the Force. This inquiry has a very different emphasis to the Levi Bellfield case explored in Manhunt S1; the victims were elderly, and the crimes were unsolved for many years. The drama explores how Colin came late to the inquiry and helped solve it in a matter of weeks, taking an incredibly dangerous serial rapist off the streets.