This feature-length documentary retraces the journey of 4 Canadians who set off to climb the perilous north side of Mount Everest without the use of oxygen or sherpas. The group's ordeal gives us a rare insight into the human condition under stress, and, while immobilized on the edge of the mountain by extreme weather, we share the tensions that afflict the group's solidarity - threatening the dream of attaining the summit itself.

• Documentary