Jack and his younger sister, Annie, stumble upon a tree house filled with books. Before Jack and Annie can figure out the mystery of the tree house, it whisks them back to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark, or will they be become a dinosaur's dinner?
Text © 1992 and 2012 Mary Pope Osborne Illustration © 1992; 2012 Sal Murdocca Production ℗ 2017 Penguin Random House LLC.