The summit of K2, 1 August 2008. An exhausted band of climbers pump their fists into the clear blue sky - joining the elite who have conquered the world's most lethal mountain. But as they celebrate, far below them an ice shelf collapses and sweeps away their ropes. They don't know it yet, but they will be forced to descend into the blackness with no lines. Of the thirty who set out, eleven will never make it back.

No Way Down weaves a tale of human courage, folly, survival and devastating loss. The stories are heart-wrenching: the young married couple whose rope was torn apart by an avalanche, sending the husband to his death; the 61-year-old Frenchman who called his family from near the summit to say he wouldn't make it home. So what drove them to try to conquer this elusive peak? And what went wrong that fateful day?