Marco Siffredi was the first person to make a complete snowboard descent
of Mount Everest in 2001, and was regarded by many as the world's best
snowboarder. But the following year in 2002, Marco mysteriously
disappeared on Everest while attempting a more difficult route known as
Hornbein Couloir, an unrelentingly steep, difficult to access route with
a high failure rate. Using exclusive never-before-granted interviews
with family and friends, Evans aims to solve Everest's greatest mystery
in nearly a century while exploring Marco's pursuit of a dream, his love
of freedom and adventure, and how his French family was forever altered
by his loss.