Nell is about to go on a Gumbling rite of passage—the Multi-Disciplinary Wilderness Engagement Adventure—when all of the seventh graders spend a whole week in the forest! Sure, it’s an Enchanted Forest that’s full of gumblecreatures, where your most secret wish could be granted at any moment, but that’s nothing unusual around here. What’s REALLY magical is that Nell gets to be on a team with ALL her best friends, learning about nature stuff and teamwork and having their very own campout (including roasting marshmallows)! Great friends + forest fun = best summer ever… Except her Thumbkin friend Gil has been a bit of a grump lately. And everyone's secret crushes are making things super awkward... So when the whole gang gets shrunk down to Thumbkin size after a wish gone wrong, Nell's problems get a whole lot bigger.