Meanwhile, the murder of a chemist lifts the lid on a backstreet abortion racket concealing a nefarious scheme.
While the team of H Division investigates, Dr Frayn (Louise Brealey) sets out to modernise the practices at Obsidian Clinic, but faces conflict with both Long Susan and the authorities.
Meanwhile, the dark and corrupt streets of Whitechapel bear witness to the vicious stabbing of a local woman. Over one long rainy night, H Division must unearth the true culprit before the weight of the authorities bears down upon them.