Something evil has swept into the small Maine town of Castle Rock on the heels of the latest winter storm. Sheriff Norris Ridgewick and his team are desperately searching for two missing girls.

In Washington D.C., thirty-seven-year-old Gwendy Peterson couldn't be more different from the self-conscious teenaged girl who once spent a summer running up Castle Rock's Suicide Stairs. That same summer, she was entrusted - or cursed - with the extraordinary button box by a mysterious stranger in a black suit. Gwendy has never told a soul about the box - not even her husband.

But one day it shows up again. Inspired by the curious appearance of the box and the troubling disappearances in her hometown, Gwendy returns to Castle Rock, where time is running out for the girls as a dangerous man is preparing the unthinkable . .