Famous British mountaineer Winter wants to climb a difficult summit, the Citadel. He goes to a small village but no guide wants to accompany him. A young man from the village, Rudi Matt, whose father died fifteen years earlier during an attempt to climb the Citadel, is determined to accompany him, with the help of his uncle. Winter also manages to hire a guide from a neighboring village and competitor, Emil Saxo. The roped party of four men then begins the ascent of the still untouched summit.