By day, the Forest belongs to people; by night, to the monster. The ominous Moon Stranger takes those who, in the dark, dared to cross beyond the safety fence of the settlement. Finn knows this isn’t just fairy tales—the Moon Stranger took his sister. Finn also knows there are boys who live in the Forest all the time, raiding villages, and the Moon Stranger is no obstacle for them. That means they know how to outwit the monster. And they can help find its lair—and save his sister.