'The Plague Widow' part 3 of 8. 'Deathships' haunt the Volga - floating mass graves, Viking ship crews struck down by the plague in transit. They present an irresistible temptation to the quarantined town: precious cargo there for the taking if only a volunteer could be found to risk infection and pull the ship to shore. But the plague's been hard on everyone, and to a boatload of dying Vikings, they could be thinking the same thing.