"A family album: leather-bound, thin, its pages yellow with age. There are images on every page-black and white to start with, then Kodacolor." So begins Nicholas Delbanco's new novel, It Is Enough, a chronicle of the German-Jewish Hochmann family, which is also a chronicle of the twentieth century and its repercussions here and now. While Frederick Hochmann, a widower, looks back on his long life from New Canaan, Connecticut, the drama...