Alexandra, a well-known actress, is looking forward to her birthday and annual party with her family and twin sister Manon. But Manon has vanished into the night.
After Guillaume's discovery, the police search the area but find nothing more. In Manon's paperwork, Alexandra finds a medical report with some surprising news.
Convinced that he is responsible, Guillaume turns himself in but DCS Gabriel Lacroix doubts that Guillaume is the guilty party. But how can he explain Benoit's evidence?
The police close the file, leaving the family alone with their grief and soul-searching over Manon. Alexandra follows her intuition to find someone she believes is involved.
A memory of a vital incident from the accident that killed her father brings Alexandra's world crashing down. And the family must communicate the truth to each other before it tears them apart.