He'd blacked out in the snow-swept night somewhere on Mt. Everest's airy northeast ridge. Now Kilian Jornet was lost, exhausted and delirious, whipped by a fierce wind in the "death zone" high above 8,000 meters (26,200 feet). The superstar Catalan climber had achieved a Superhuman Feat, scaling the world's highest mountain twice in six days without supplemental oxygen, both in breathtakingly fast times. But now, Jornet was teetering above the plunging precipice of the North Face with no idea how he got there or how to get to safety.