Film-maker Michael Ogden re-examines the case of Dennis Nilsen, asking why his victims are all but forgotten today and speaking to police officers who reveal regret over the premature closure of the investigation.

Serial killer Dennis Nilsen narrates his life and horrific crimes via a series of chilling audiotapes recorded from his jail cell.

Known as a “kindly killer”, this documentary details Nilsen’s moves between 1978 and 1983, after which he admitted to killing as many as 15 young men.