"In 2008, nine mountaineers failed to return from a winter backpacking trip in the New Mexico mountains. At their final campsite, searchers found a bizarre scene: something had appeared at the door of their tent so terrifying that it impelled them to slash their way out and flee barefoot to certain death in a blizzard. Despite a diligent search, only six bodies were found, two violently crushed and inexplicably missing their eyes. The case, given...

The goal was clear: defeat the Nazis who were entrenched high in the snowy mountains of Italy. Drawing together an elite group of champion skiers, mountain climbers and European mountaineers, the U.S. Army created the 10th Mountain Division, America's only mountain and winter warfare fighting unit. From the intensive training atop the Colorado Rockies to the spectacular night climb of Italy's Riva Ridge - where the 10th scored their biggest victory...