On a dim winter afternoon, a young Irish immigrant opens a gas tap in his Brooklyn tenement. He is determined to prove―to the subway bosses who have recently fired him, to his pregnant wife―that “the hours of his life . . . belonged to himself alone.” In the aftermath of the fire that follows, Sister St. Saviour, an aging nun, a Little Nursing Sister of the Sick Poor, appears, unbidden, to direct the way forward for his widow and his unborn child.