In the waning years of the Soviet Union, a sad young Finnish woman boards a train in Moscow. Bound for Mongolia, she’s trying to put as much space as possible between her and a broken relationship. Wanting to be alone, she chooses an empty compartment—No. 6.—but her solitude is soon shattered by the arrival of a fellow passenger: Vadim Nikolayevich Ivanov, a grizzled, opinionated, foul-mouthed ...