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

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

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.