Sara’s Pick: Emma in the Night by Wendy Walker

Two sisters vanish one night leaving a car and shoes at the beach. Three years later, one of them returns. Held captive on an island off the coast of Maine and finally escaping, Cass is frantic to have help finding her sister. But forensic psychologist Dr. Abby Winters feels Cass’s story has holes and inconsistencies in it. As she looks into the family dynamics of a narcissistic mother, a weak father, new stepfather and stepbrother, her own research sheds insight into what has happened.