A mysterious island; a terrifying weapon; an ancient prophecy brought to light? When the annual frost-dragon migration fails to happen, Dr Drake and his apprentices Daniel and Beatrice sense that something sinister is afoot ? could dark dragonologist Alexandra Gorynytchka be up to no good again? The trio are whisked off to the Lost Isle of Dragons, where they must face grave danger to prevent their enemy from finding the Hammer of the Dragons: a legendary weapon deadly to all dragonkind. Age-old rivalries are laid bare in this thrilling climax to the Dragonology Chronicles.