In this documentary, climbers from the Club de montagne canadien scale a nearly perpendicular wall of Precambrian rock, 65-meters high, in the Laurentian Mountains north of Montreal. Mini-transmitters carried by the climbers, and daring camerawork, convey every moment of suspense as two men and a woman grope and pull and inch their way upward. Two veteran mountaineers, Fritz Wiessner and John Brett, appear briefly in the film.