The Grave Robbers of Genghis Khan

When the ancient Italian volcano Mount Vesuvius erupts right before their eyes, djinn twins John and Philippa Gaunt know that a brand-new adventure has found them. Soon, they learn that volcanoes all over the world are beginning to erupt and are spewing a strange golden lava. It quickly becomes clear that there is a peculiar-and perhaps evil-force at work, causing these disasters. Will John, Philippa, and their uncle Nimrod be able to use their powers to save the day once again?