This article is about the book Isle of the Dead. For the article about the location, go to Isle of the Dead (location). Isle of the Dead is the third book in the Deltora Quest 3 series and thirteenth in the collective Deltora Quest series. It centres around Lief, Jasmine and Barda's attempts to destroy the Sister of the West. The book also reveals what happened to Doran the Dragonlover, who disappeared over 100 years ago.