As the police close in John Marlott needs to rescue Esther from Hervey and Dipple, and resurrect both his own and her fortunes in an epic season finale.
Marlott's new intelligence brings him closer to a solution and leads him to an apparently deserted tower. However, there are darker and colder dangers inside.
An unexpected encounter with the mysterious Frederick Dipple suggests that Marlott needs to protect his allies, who he realizes are increasingly in danger.
Marlott is convinced that Billy Oates and the origin of the fever killing local families will lead him to Lord Daniel Hervey.