A routine debt collection performed by Capshaw at a shop is complicated when the proprietress is killed and a dungeon discovered. Reid and Drake investigate, hoping to uncover Capshaw's dealings and find the girl the dungeon was kept for.
Reid faces scandal due to Best's deviousness, Drake readjusts to life back home, Rose faces the prospect of a new future, while a grim discovery in a Whitechapel slum may lead to the downfall of many.
As Mathilda roams the streets, Drake finds Reid and informs him that she is alive. The team reassemble and try to locate her, while Best's investigation narrows in on Capshaw.
The body of a ship's engineer is found in the Thames, and his murder seems to be connected with the arrival of a powerful shipping magnate and a group of Americans who are hunting Jackson and Long Susan.
As a result of Goodnight's fiendishness, Jackson stands accused of being Jack the Ripper, with Reid desperately trying to clear his name. Meanwhile, Rose's plan to better herself backfires dramatically.
As the investigation into Linklater's death continues, Reid and the team deal with the murder of a woman whose recently delivered baby has been stolen, which leads them to a former foe.
Drake's life begins to unravel as he questions whether he sent an innocent man to the gallows, and Rose struggles to convince anyone about what she saw.