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. If the twins can't figure out who is responsible, and stop him, a environmental catastrophe of epic proportions will devastate the planet. Will John, Philippa, and their uncle Nimrod be able to use their powers to save the day once again? Ages 9+.