Facing the world's second-highest peak, the Karakoram Range's K2 in Northern Pakistan, mountain climbers encounter incredible dangers, including a huge serac (an overhanging glacier), snow-obscured crevasses, whiteouts and avalanches that have killed even accomplished mountaineers. With clarity and compassion, renowned peak-scaler Viesturs recounts campaigns up K2's 28,000-plus feet from the late 1930s through the tragic 2008 season that saw 11 climbers die in the space of 36 hours.