While she was jogging Lisa Campion , the daughter of the retired police officer Fabio Campion , discovered the frozen corpse of Julien , a child who disappeared 20 years ago.The police officer Simon Beauregard is then sent to Roches Noires , a village of the Tarentaise Valley, for the criminal investigation.

Back in Brittany, Captain Morgane Ledantec is confronted with the discovery of human bones after the fall of a sacred oak during a storm. The victim was a follower of druidism which Morgane was introduced to as a teenager by her godmother.

Paul is a man uncomfortable in his own skin. His 20-year marriage to Marielle is put to the test when she catches him in women's clothes, and he can no longer live the lie. Paul attempts suicide, making Marielle realize that his life means much more to her than his appearance. She loves his true self more than the person he pretends to be. Convinced that their love will allow them to reinvent their life together, they and their two children brave the reaction of others and live with tolerance and hope.

Two sisters suspect foul play after the mysterious disappearance of their mother in the mountains.