On the final leg of their journey, the explorers summit a massive mountain of rock and ice in the Juneau Icefield. As a final farewell gift, Alaska throws a punishing winter storm their way. Expert mountain climber Willi Prittie takes control of the crew from the start. The men try to stay together and alive as whiteout conditions worsen, gathering essential survival materials along the way. They proceed up the icy ridges, but one wrong step nearly plunges one of the explorers over the edge.