Another long summer holiday brings more adventures for George, Julian, Dick, Anne and Timmy the dog, when they meet Marty Bach, a young man who appears at first to be behaving rather oddly. It turns out his deceased father had discovered a supposedly intact dinosaur skeleton, but crooks have stolen the code that reveals the coordinates to the legendary "Valley of Dinosaurs". If the kids, Marty, and, of course, Timmy can't rescue the code and get to the valley first, the priceless bones will be lost forever. 　　译文(2): 另一个漫长的暑假给乔治、朱利安、迪克、安妮和小狗蒂米带来了更多的冒险，他们遇到了马蒂 · 巴赫，一个刚开始表现得相当古怪的年轻人。原来他死去的父亲发现了一具据说完好无损的恐龙骨架，但是骗子偷走了密码，这个密码揭示了传说中的“恐龙谷”的坐标。如果孩子们，马蒂，当然还有蒂米不能解开密码先到山谷那些无价之宝就会永远消失。