When Casper is transported to the strange world of Rumblestar, he must work with his first real friend, Utterly Thankless, to stop the monstrous creatures terrorizing the land. Casper Tock hates risks and is allergic to adventures. So it comes as a nasty shock to him one day when he hides from bullies in an ancient grandfather clock--and ends up finding an entire world inside. Casper discovers that this sky kingdom of Rumblestar is one of the four...