...It was an astounding discovery. The mountain was more than 150 miles from the nearest settlement, in a spot that had never been explored. The Soviet authorities had no records of anyone living in the district....

The sight that greeted the geologists as they entered the cabin was like something from the middle ages. Jerry-built from whatever materials came to hand, the dwelling was not much more than a burrow—"a low, soot-blackened log kennel that was as cold as a cellar," with a floor consisting of potato peel and pine-nut shells. Looking around in the dim light, the visitors saw that it consisted of a single room. It was cramped, musty and indescribably filthy, propped up by sagging joists—and, astonishingly, home to a family of five....

Slowly, over several visits, the full story of the family emerged. The old man's name was Karp Lykov, and he was an Old Believer—a member of a fundamentalist Russian Orthodox sect, worshiping in a style unchanged since the 17th century. Old Believers had been persecuted since the days of Peter the Great, and Lykov talked about it as though it had happened only yesterday; for him, Peter was a personal enemy and "the anti-Christ in human form"—a point he insisted had been amply proved by Tsar's campaign to modernize Russia by forcibly "chopping off the beards of Christians." But these centuries-old hatreds were conflated with more recent grievances; Karp was prone to complain in the same breath about a merchant who had refused to make a gift of 26 poods [940 pounds] of potatoes to the Old Believers sometime around 1900.

Things had only got worse for the Lykov family when the atheist Bolsheviks took power. Under the Soviets, isolated Old Believer communities that had fled to Siberia to escape persecution began to retreat ever further from civilization. During the purges of the 1930s, with Christianity itself under assault, a Communist patrol had shot Lykov's brother on the outskirts of their village while Lykov knelt working beside him. He had responded by scooping up his family and bolting into forest....