A couple is renovating a newly-bought house when one night, the husband finds three corpses in the wall: children! Chief Inspector Virginie Sevran is in charge of this saddening and horrifying investigation, which will lead her and her partner Biolet to investigate broken families in tough situations and take them deep into the intricate bureaucracy of the child welfare service. At the same time, the two detectives have to make time for their own families: Biolet’s wife is giving birth to a baby boy two years after they suffered a stillbirth, and Sevran’s husband and eight-year-old daughter want to spend more time with her.
One thing's for sure: nothing will ever be the same again…