Harry is older, and he's not the only one who's got bigger! When a mysterious set of dinosaur cards appear on his key-ring, Harry soon finds that he can call on an army of Back-Up Dinosaurs, for some monster-sized muscle!
And when Harry hears that Mr. Oakley has been robbed by a nasty crook, he hopes that he and his friends can solve the crime.
A W. F. Howes audio production.
