It´s Christmas Eve in Dinosaur Cove and Tom and Jamie are hoping for snow. There´s just time to go and visit their dinosaur friend, Wanna, in their secret world of real dinosaurs, and wish him a merry Christmas. But when they emerge from the cave, the Jurassic jungle has disappeared and there´s snow everywhere! And what´s that in the distance? It´s a herd of woolly mammoths - the boys are in the Ice Age! Jamie, Tom and Wanna set off on a snowy adventure with blizzards, avalanches, a sabre-tooth cat, and a young woolly mammoth that needs their help to get back to its herd. As they search for the lost herd the boys come across another unexpected discovery - something so amazing they can hardly believe it. This double-length story is something that readers can really get their teeth into and is non-stop adventure from the first page to the last.