Brother and sister Jack and Annie have just discovered a tree house full of books. When Jack looks through a book about dinosaurs and wishes he could see a real one, suddenly the wind begins to blow, and the tree house starts to spin wildly. When it finally stops, Jack and Annie open their eyes to find they have been transported back to the time of the dinosaurs. Jack and Annie embark on a once-in-a-lifetime adventure, making friends with some of the dinosaurs along the way, as they try to make their way back home.