Dyatlov Pass

"In February 1959, a group of friends went on a ski-hiking trip to a remote mountain in the northern Urals. Something killed them. ... Alarmed and mystified, the Soviet government classified the case as top secret, and closed off the region to all civilians for the next three years. Fifty years later, a man is discovered wandering in the wilderness, exhausted and terrified"--Page 4 of cover.