Hiding in Plain Sight by Susan Lewis

The surprising new novel from the Sunday Times Top Ten bestselling author of Behind Closed Doors and The Moment She Left .
Andee Lawrence is in heaven. Well, the South of France to be exact.
Ex-detective Andee has swapped freelance investigation and a broken marriage, for two months in Provence, renovating a beautiful villa with the new man in her life. Pottering around a small picturesque town on an early summer's day, she is at peace.
But her world is about to be shattered.
Remember me?
Two words spoken by a woman from the back of a car that say so much yet reveal so little.
As the car drives away Andee is left reeling, overwhelmed by shock, confusion, self-doubt and mounting trepidation.
Almost thirty years ago, fourteen year old Penny had disappeared from her family's life, never to be heard from again. It is the missing child case that has haunted Andee her whole life; And now Penny - Andee's sister - is back.
The question is: why?