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As a final final reckoning between the chiefs of H Division and K Division becomes inevitable, Jackson's desire to use the the stolen diamond to finance his future leads to conflict with the De Graal monopoly.
H Division investigate a long-firm scam targeting local craftsmen. Meanwhile, Silas Duggan ups his hold on Susan's life and Captain Jackson's brother pays him a visit.
DI Reid suspects that the same person is behind a spate of arson targeted at both synagogues and churches. Meanwhile, Sergeant Drake's married bliss is interrupted when an old friend of his wife, Gabriel Cain, appears.
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.
When a high-profile opponent of Home Rule is murdered shortly after an Irish bomber escapes from prison, Chief Inspector Abberline is convinced that the Irish Republican Brotherhood is active again. Reid is ordered to infiltrate Whitechapel's Irish community.
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.