By Donnie Eichar, with J.C. Gabel and Nova Jacobs (Chronicle Books, 2014)

★ New York Times Best Seller

In 1959 Soviet Russia, a group of students set out from their hometown of Sverdlovsk on a winter excursion into the northern Ural Mountains. They never returned. Their nine bodies were eventually found a mile from their campsite, many without shoes and winter clothing. Violent injuries and a conflicting set of clues have confounded investigators for decades, making this one of the most enduring and debated mysteries in Russian history.