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 Unmapped Kingdoms in charge of controlling the weather in Casper’s own world. All Casper wants is to find his way home, but Rumblestar is in trouble. Casper must team up with a strange girl named Utterly and her miniature dragon, Arlo, to free both their worlds from the evil harpy Morg.
