Abi Elphinstone

"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...

"In this final adventure in the Unmapped Kingdoms, a young orphan rises up to stop the evil harpy Morg once and for all"--