Secret traumas again haunt Sparks's characters, in the author's fourth novel (after The Notebook; Message in a Bottle; A Walk to Remember). Denise Holden, the 29-year-old heroine, is destitute and forced to live in her mother's old house in Edenton, N.C. She's also the single mother of a handicapped child, Kyle, a four-year-old with "auditory processing problems" that render him unable to express himself or to fully understand others. Though she doesn't suspect it...