Royal Changeling

Plot

"The book recounts the Monmouth Rebellion and Battle of Sedgemoor (1685) accurately and in great detail, while adding a layer of fantasy that brings figures from English mythology to life as both combatants and political forces. The fantasy layer builds momentum and becomes increasingly vivid as the story of the protagonist, Theophilus Oglethorpe, unfolds. Toward the end, as Theophilus engages in pitched battle with Monmouth and his allies, his wife, Eleanor, is simultaneously besieged by supernatural forces in their mansion in Godalming, Surrey"--Wikipedia.