Hart Island, an uninhabited strip of land off the Bronx, is America’s largest public cemetery, sometimes known as a “potter’s field.” Since 1869, more than a million people have been buried on Hart Island, including early AIDS patients, unidentified and unclaimed New Yorkers, immigrants, incarcerated people, artists, and about ten percent of New Yorkers who died of COVID-19. Many people buried there are shrouded in anonymity. The island has no headstones or plaques, just numbered markers. Simple pine coffins are stacked in mass graves. In many cases, explanations for how bodies came...