After being abducted by a child killer and locked in a soundproof basement, a 13-year-old boy starts receiving calls on a disconnected phone from the killer's previous victims.

When a mysterious force begins to disrupt their big summer fun, Noah and his friends team up with a retired police detective to embark on a monstrous adventure to save their island.

Based on the book by the same name, the film tells the inspiring story of a 12-year-old boy who, separated from his family by a fast-moving storm, must fight to stay alive during his nine-day adventure lost in the backwoods of Maine.