The final installment of bestselling P. B. Kerr's magical Children of the Lamp series!Djinn twins John and Philippa are off on another enchanting, and dangerous, adventure in the last book in the bestselling Children of the Lamp series. As volcanoes begin erupting all over the world, spilling golden lava, the twins must go on a hunt for the wicked djinn who wants to rob the grave of the great Genghis Khan. Can the twins stop this latest disaster before the world is overwhelmed? Join John and Philippa, their parents, Uncle Nimrod, and Groanin as they must defeat an evil more powerful than any they've ever faced before. . . .