I was compelled to read this book after watching the fabulously undiscovered horror film Devil's Pass, (which fictionalizes the Dyatlov Pass Incident
slightly).
Here's the story: In 1959, nine experienced hikers went
on a challenging mountain hike and were found dead outside their tents. Something made them run outside barely clothed, despite the fact that they had adequate heat and shelter in their tents.
Many conspiracy theories
resulted, from avalanche to aliens to government agents to weapons testing to
yeti. Although I found Eichar's travels to Russia to the site far less than
compelling, I like his conclusion that it was a combination of a Karman vortex
(high wind resulting in unnervingly loud noises) and the emotional effect that
infrasound can have on people -- only recently discovered. A bit on the skimmable side, but still interesting.