"The McNallys stop at a Colorado lodge for the night and by morning, they are snowed in! While looking for a place to study, Gavin and his sister, Chloe, go through a door into a dark hallway. The door locks behind them, and it's getting colder by the second. Will Gavin and Chloe have to weather the blizzard in the dark, frozen passage?"--Page [4] cover.