Marlott finally pieces together the movements at the hospital, but the number of suspects continue to plague his mind. Robert Peel meets with William Chester. Marlott gets authorization to use a pistol.

Boz publishes a newspaper article about the murders which causes a public outcry and infuriates Peel on the eve of the Anatomy Act. Mary Shelley, the author of Frankenstein, follows her own line of enquiry into the medical practice of Sir William Chester, uncovering secrets from the past. Marlott decides to go back to Greenwich where it all began - is there something he is missing?

An unexpected encounter with the mysterious Frederick Dipple suggests that Marlott needs to protect his allies, who he realizes are increasingly in danger.

London 1830. John Marlott escapes the Bethlem Hospital seeking his revenge on Lord Daniel Hervey. The hunter soon becomes the hunted.

Marlott is convinced that Billy Oates and the origin of the fever killing local families will lead him to Lord Daniel Hervey.

The police apprehend a gang of opium smugglers on the banks of the Thames, but as he stands at the water's edge, Inspector John Marlott makes a shocking discovery. The body of a dead child is washed up on the shore, but further examination of the corpse reveals a grotesque state of mutilation. Home Secretary Sir Robert Peel orders Marlott to lead the investigation, while details of the investigation must remain confidential.