The story is based on an actual mysterious incident that occurred in Russia’s remote Dyatlov Pass in 1959. Nine experienced hikers were found dead, their bodies emanating high levels of radiation, and their tents — and bodies — damaged savagely from the inside out. Now, in 2012, five ambitious American students attempt to solve the mystery by revisiting the site. Once at Dyatlov Pass, they encounter events more bizarre and terrifying than anything they could have imagined.