In this book, Ben, Juli, and Professor Pfeffernuss travel to North America. A new dinosaur park is set to open here. A fresh dinosaur track suggests that a dinosaur species may have survived. During their adventurous search through the park, the children gradually uncover the mystery of the dinosaur track with the help of clues from the tiptoi pen. In addition to impressive sounds, this volume also offers numerous informative and narrative texts for readers.