After overwhelming Scotland, the glacier gouged its unstoppable way south. Only a few people remained in the desolate, frozen streets of the cities of Northern England. As the daily blizzards blew stronger and the icebergs on the River Mersey grew larger, Norman and Chrissy Leonard prepared to flee their Liverpool home. When Norman heard -- The Roar -- he knew the time for preparation had passed. An unspeakable dread twisted inside him at that primordial sound. The glacier was pushing more than just snow and ice ahead of it. A nightmare was coming, one Norman would not be able to wake from.