Kazuo Ishiguro’s imagination lives in a world all its own. He beguiles his readers in rich and confounding ways, with tricks too outré. In Never Let Me Go he lays out for our edification the lives of three children, Kathy, Ruth, and Tommy. Something is off fairly immediately with these young ones: they spend their days at a boarding school called Hailsham, and we learn nothing of their parents. At first I expected to see them described, hear them speak, but no. The children age from early...