Chris Landrum's idyllic life of retirement on the South Carolina barrier island of Folly Beach just got turned upside down. After more than two decades, his ex-wife, Joan, calls to wish him a merry Christmas. He can tell she wants to tell him something more, but their conversation is cut short before he learns anything. Something's up. A second call from Joan's best friend delivers startling news. Joan's husband has just been killed in an...