Episode one, Chapletown, explores the early years of the investigation from 1975, when the first Ripper murder occurred.The location of the first two murders in Chapeltown, then well-known as Leeds's main red light district, led the police to decide that prostitution was the connection between the attacks. After the second murder in January 1976, the police announced they were hunting a ‘prostitute killer' and the investigation became driven by this theory.