Jamie and Tom are ready for another adventure in their secret dinosaur world - and this time they're going right back to the dawn of the dinosaurs and into the Triassic era. There are many weird and wonderful creatures here and the boys enjoy exploring this new place, but when a Lystrosaurus grabs Jamie's backpack and disappears down a hole with it, the boys and Wanna have a problem. If they don't find the backpack, they'll never be able to get home again ...Join Jamie, Tom and Wanna in this latest exciting instalment of the fantastic Dinosaur Cove series.