In each section of Michael Cunningham's bold new novel, his first since The Hours, we encounter the same group of characters: a young boy, an older man, and a young woman. "In the Machine" is a ghost story that takes place at the height of the industrial revolution, as human beings confront the alienating realities of the new machine age. "The Children's Crusade," set in the early twenty-first century, plays with the conventions of the noir...