When a petty thief falls though a glass roof in his attempt to escape from the police, what should have been the death of him marks the beginning of a while new life. After his broken body is reconstructed by an ambitious young doctor, he is released from prison, and, with the help of Victorian London's extensive sewer system, he becomes the most elusive burglar in the city.
On a remote Scottish island, children are dying in mysterious circumstances. Montmorency is needed to help solve the mysteries, but he has demons of his own to confront.
Fleeing across a roof on a dark night in Victorian London, a thief crashes through a glass skylight to almost certain death. But an ambitious young doctor revives and reconstructs his shattered body, proudly showing off his handiwork at the Scientific Society where the city's intelligentsia meet. It is there that the robber picks up the key to a new existence, and on his release from prison begins to lead a double life.