A rash of abductions of young boys that end up brutally murdered is plaguing London. Crime consultant William James Moriarty discovers a clue linking all the victims, and he comes up with a plan.

Albert, the son of an earl, is deeply discontent with Britain's class system. When he decides to visit a charitable aid organization, a brilliant young orphan there catches his attention. This strangely compelling boy seems wise beyond his years...

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.

William begins teaching at a university, and is invited to dinner at the home of the Viscount of Belfor. He and his brothers receive a tour of the viscount's well-kept conservatory, but are taken aback by what they hear of the gardener and his wife.