Frances Arsentiev was the first American woman to reach the summit of Everest without supplemental oxygen. Her husband, experienced Russian climber Sergei Arsentiev, was by her side. Together, they entered the "death zone," where every mistake is the last. But after their long-awaited triumph, everything went wrong. A disappearance, a desperate rescue attempt, and a sacrifice that climbers still talk about to this day… A story that transformed a truly remarkable achievement into one of Everest's darkest tragedies.