A rash of abductions of young boys that end up brutally murdered is plaguing London, and police are powerless to stop it. When William Moriarty discovers a clue linking all the victims, he and his brothers take an interest in the case.

In 1866, a brilliant young orphan and his ailing younger brother are taken in by a charitable aid organization, where they catch the attention of the son of an earl, who is discontent with Britain’s class system.

Albert invites the brothers to come live at the Moriarty’s estate, but the pair are not warmly welcomed by the other members of the household. Albert grows increasingly disturbed by his family’s intolerance, and resorts to drastic measures.

Receiving a new name, Bonde joins the Moriarty ranks, and is sent to retrieve the contents of a safe deposit box with Moran, Louis, and Fred. But when an unexpected bank heist spurs the others into spontaneous action, Bonde is left wondering what to do.

Adam Whiteley, a young MP in the House of Commons working toward an equitable society, garners public support as a "White Knight." Milverton is hired by those opposed to Whiteley to oust him. William takes interest in Whiteley, and decides to test him.

Whiteley goes alone to deal with the House of Lords with the irrefutable proof obtained from Albert in hand, but finds Milverton, the king of blackmailers. Even as Whiteley negotiates with him, Milverton's devilish clutches close in on his dear brother.

John introduces Sherlock to Mary, his fiancée. A stunned Sherlock realizes that Mary has another concern. She produces six pearls, detailing their connection to her missing father. She asks Sherlock to look into the matter, but is holding something back.

Milverton blackmails Mary, exploiting her dalliance in antigovernment activities as a student. Sherlock decides to sneak into Milverton's estate to steal his evidence, but even that act was anticipated. Sherlock finds that he is not the only trespasser.

When William James Moriarty claims responsibility for being the Lord of Crime in all the papers, aristocratic condemnation and public anger falls upon the Moriartys. The final problem of the Moriarty Plan that William has concocted at long last begins.

William aims to complete his plan with his death, as Albert and the others each carry out their roles. Meanwhile, Sherlock deduces William's true reason for having him vanquish the Lord of Crime. Overlooking London, the pair face each other one last time.

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