In the summer of 1989, a car crashes off a mountain road in Corsica. Clotilde, fifteen years old, is the only survivor.

In 2016 she returns to Corsica to exorcise the ghosts of the past. But while she is there, she receives a letter signed by her mother. Is she still alive?

It is summer 1989 and fifteen-year-old Clotilde is on holiday with her parents in Corsica. On a twisty mountain road, their car comes off at a curve and plunges into a ravine. Only Clotilde survives.

Twenty-seven years later, she returns to Corsica with her husband and their sulky teenage daughter. Clotilde wants the trip to do two things - to help exorcise her past, and to build a bridge between her and her daughter. But in the very place where she spent that summer all those years ago, she receives a letter. From her mother. As if she were still alive.

As fragments of memory come back, Clotilde begins to question the past. And yet it all seems impossible - she saw the corpses of her mother, her father, her brother. She has lived with their ghosts. But then who sent this letter - and why?