Eight-year-old Jack & his little sister Annie are playing in the woods during their summer holiday when they find a mysterious tree house full of books. But these are no ordinary books.. . And this is no ordinary tree house.. . Jack & Annie get more than they had bargined for when Jack opens a book about dinosaurs & wishes he could see them for real. They end up in prehistoric times with Pteranodons Triceratops & a huge Tyrannosaurus Rex! How will they get home again? The race is on.. .!