When they approach the top of Alaska's Mt. McKinley — the highest mountain in North America — three British climbers are caught in a terrible blizzard. They take shelter in a crevasse, but there's no escaping the freezing temperatures. Frostbite takes its toll on one climber — swelling his face, forcing his eyes shut, and leaving him almost blind — and when morning comes, it's clear he might not make it down the mountain alive. They realize they must get down fast or watch their friend die. With their radio broken, the team has no choice but to send one man down the mountain alone to raise the alarm. But a terrible fall leaves him close to death. With their best chance of rescue gone, the climbers can only hope they'll survive America's highest mountain.