An international shipping magnate, Theodore P Swift (Ian McElhinney), arrives in London with his Pinkerton retinue to complete the acquisition of an ailing London shipping line. The leader of the visiting Pinkerton clan, Frank Goodnight (Edoardo Ballerini), badly wants to find Captain Homer Jackson. Jackson, however, doesn’t wish to be found. Meanwhile the murdered body of an engineer, inventor of a new ship's engine that could save the ailing company, draws Reid's attention just as Jackson and Long Susan's past comes back to haunt them. Reid's investigation of the engineer's wife, (Shauna Macdonald), has disastrous results for Constable Hobbs and Goodnight's handiwork places Jackson under the suspicion of Chief Inspector Abberline when a prostitute is found murdered in the same manner as the Ripper's victims.