Based on fact, this gripping film realistically re-creates one of the most miraculous accidents in the history of mountaineering. This is a nail-biting story of mental and physical hell, extreme pain, horrific choices and a nightmare bid for survival. Partly reconstructed, partly told by the two survivors, MacDonald artfully paints the story of two climbers who, 20 years ago, decided to climb the unconquered Siula Grande, a remote 21,000-foot peak in the Peruvian Andes. After a successful three-and-a-half-day ascent, Simpson falls and breaks his leg. Despite the risk to himself, Yates is willing to drag Simpson out. That is until, still attached, Simpson falls into an abyss. Thinking Simpson is dead and worried he would be dragged with him, Yates cuts Simpson free. What ensues is an incredible tale of survival against insurmountable odds.