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. What's more, Casper is now stuck in Rumblestar, and the only person there who doesn't think he's a...

"Twins Fox and Fibber find themselves in one of the Unmapped Kingdoms and set off on a quest to find the Forever Fern hidden deep in the glow-in-the-dark rainforests of Jungledrop"--