1959… Nine experienced hikers went into the mountains of Russia. They set up camp for the night. But something terrified them. In the middle of freezing darkness… they cut their way out of their own tent. Barefoot… some without jackets. They ran into the snow. Search teams later found their bodies scattered across the mountain. Some had strange injuries. But there were no signs of a fight. No clear attacker. More than 60 years later… No one knows what scared them that night.