In Causlip Grove, nothing seems out of place. The grass is neatly trimmed, the sidewalks are clean, and the sound of the ice cream shop fills the atmosphere. However, some children disappear and no one seems to notice, as no one remembers them. Not even their friends. Not even their teachers. Not even their families. But Levi and Kat remember, and suddenly they are the only ones who realize why everyone is in so much danger when the night frost falls. A terrifying presence lurks in a place no one would imagine, and Levi and Kat must confront it and save the lost children - before it devours the entire town.