Jack and Annie arrive in Pompeii, a city in the Ancient Roman Empire in A.D. 79. They have to find an ancient story there. The night before that, Annie dreamt that fires are burning and the ground was shaking. She thinks it's a bad sign and wants to leave Pompeii as soon as possible. Right after they get hold of the ancient story, the ground begins to shake. It's a volcano! They are racing towards their tree house but the bridge that connects them to it is destroyed by the lava! How can they go back home?