While I Was Gone by Ms Sue Miller
Thirty years ago Jo Becker's bohemian life ended when she found her best friend brutally murdered. Now Jo has everything: work she loves, a devoted husband, three grown daughters and a beautiful home. But when an old friend settles in her small town the fabric of Jo's life begins to unravel, as she enters a relationship that returns her to the darkest moments of her past, imperilling all that she loves.