John Flanagan gets spooky in the latest adventure in the New York Times bestselling Ranger's Apprentice The Royal Ranger series! Will and Maddie are sent to neighbouring kingdom Celtica to investigate reports of terrifying direwolves - an ancient species thought to be extinct. What they discover is even more of a threat - a sorceress who has enslaved direwolves and Wargals to her will and is building an army of creatures both living and supernatural.