Kevin MacDonald's ('A Day in September') docu-drama is based on a true story. In 1985 two ambitious young British mountaineers, Joe Simpson and Simon Yates, set off to scale the treacherous west face of the Siula Grande in the Peruvian Andes. They reached the summit on day three, but shortly after starting the descent Simpson fell and broke his leg badly. This accident turned their daring expedition into a desperate fight for survival, when Yates had to decide whether to stay with Simpson and wait to be rescued (and possibly die) or leave him behind to save his own life.