The leather walls inside were black with years of soot. The yurt was round, maybe five steps across, and braced with a lattice of smooth flat sticks and buckskin thongs. A fire blazed away in the yurt’s center, chunks of charred pine on a hearth of flat yellow stones. Dense smoke curdled the air. Two huge furry mounds loomed beside the hearth. They were Evenk sleeping bags, like miniature tents in themselves.