September 1960: on a purely punitive basis, eight scouts must climb the solid mass of Brévent to 2500 meters of altitude. The so beautiful and so majestic mountain which draws up face them very quickly reveals dangerous. All the techniques of orientation learned at the scouts will do nothing there. The teenagers find themselves delivered to themselves. Lost in the abrupt throats, the eight boys are confronted cold, with the hunger and the fear.

After nearly running over him with her cab, Patty Mitchell picks up a fare who claims to have amnesia. As he fumbles to remember the basic facts of his identity, Patty becomes interested in the stranger and decides to help him in his search. But as the pieces of the puzzle begin to fall into place, and Patty's interest becomes more personal, the stranger finds that he is the prime suspect in a murder case.