A vice ring at the offices of the GPO are uncovered during the investigation into the murder of a telegraph boy. Meanwhile, Captain Jackson attempts to find a way for him and Susan to clear themselves of the debt they owe Silas Duggan.moreless
Drake is re-united with Rose when a prominent council member is abducted from the the music hall where she now works.
The team are led into the world of circus freak shows following the murder of a woman with a tail-like protrusion at the base of her spine. With the assistance of Joseph Merrick, better known as the Elephant Man, Reid realises that his Limehouse colleague, Jedediah Shine, also has some involvement in the case. Meanwhile, DC Albert Flight arrives to replace Albert Hobbs.moreless
When one of the sergeants from K Division is assaulted DI Reid's investigation leads him and his team to Chinatown and a new and destructive opiate.