Saurus Street is just like any other street . . . except for the dinosaurs! Thomas's grandparents house is ancient. There's no electricity, and the toilet is a creaky old cabin outside. Thomas is terrified of that toilet. There's something down there . . . And when Thomas gets too close and falls down the hole, he discovers a secret that will change Saurus Street forever. Plunging pterosaurs, squiggling squid and massive meteors are all part of the greatest adventure since the Cretaceous period!