This dramatic TV show begins in April 1889 in London — six months after the last Jack the Ripper killing. H Division is responsible for policing one and a quarter square miles of East London, a district with a population of 67,000 poor and dispossessed and also filled with factories, rookeries, chop shops, brothels and pubs. The men of H Division had hunted Jack the Ripper and failed to find him. When more women are murdered on the streets of Whitechapel, the police begin to wonder if the killer has returned.