An afternoon wind funnels down deserted Old Market Street, past shuttered shops and darkened restaurants. The rowdy Irish student town of Sligo has been frozen. It is two months into a strict nationwide lockdown enforced by the Irish government to combat the novel coronavirus, which has killed more people per capita in Ireland than in the U.S. The last time Sligo was this empty—this lifeless, this restricted—was 188 years ago. Cholera was the culprit. That epidemic spawned not just death, poverty, famine, chaos, and desertion but also a legendary vampire….