Where is the missing city? What's hidden there and why? Find out all this and more!High-interest topics, real stories, engaging design and astonishing photos are the building blocks of the XBooks, a new series of books designed to engage and motivate reluctant and enthusiastic readers alike. With topics based in science, history, and social studies, these action-packed books will help students unlock the power and pleasure of reading... and always ask for more!High-tech hunt for hidden treasure! Thousaands of years ago, a great city vanished from the Arabian Peninsula. Centuries later, and halfway around the world, an amateur archeologist thinks he knows just how to find it...