The Urals, the great mountain range separating Europe from Asia, has many charms for those who wish to practice mountaineering. There is no lack of mountains and passes to challenge the courage of hikers who dare to face it. In winter, the harshness of its climate makes it an inhospitable region, almost a desert. There are however many candidates for the ascent. But one day in February 1959, a group of hikers died there in circumstances so tragic that they suggest that strange activities were taking place...