Curious and imaginative eight-year-old Emily is obsessed with fairy tales and magic. On one of Emily's excursions into the wilds of the unmanicured grounds behind her home, she discovers a crumbling bridge and attempts to cross the structure, only to have it collapse beneath her and send her tumbling into the realm of the Trolls.

In a world of lost children, friendly Trolls, a dreadful dot, pesky pirate Piskies, and an evil witch who seeks to drain magic from the world, Emily ultimately must find the strength to trust herself, and follow the path that will lead her to where she truly belongs.