Time is a Killer

Summer, 1989. Corsica. Fifteen-year-old Clotilde is the sole survivor when her family's car plunges off a narrow road into a ravine.
Twenty-seven years later she returns to the island with her husband and teenage daughter in an attempt to come to terms with her past. But then she receives a letter - from her mother, as if she were alive.
It seems impossible. Clotilde watched her parents and her brother die that day in the ravine. She has lived with their ghosts ever since. But then who sent this letter - and why?