The story of a legend of "extreme" sport. Marco Siffredi who kills himself at the age of 23 in the Himalayas after having launched the craziest challenge of the earth: climbing on the roof of the World, Everest. Then go down the most difficult way ... snowboarding.

Guest: Bertrand Delapierre, mountaineer and director of "Marco, shooting star" (7doc). Rope companion of Siffredi whom he accompanied in the Alps, and in the Himalayas.