To protect his daughter, whose existence he has just discovered, Cédric Rouget accuses himself of the murder of his office colleague in place of the young woman. The real culprit is soon identified, but to prove his guilt, a DNA test must be carried out. However, he refuses to submit to it, and justice cannot force him to do so...

The identification of DNA relaunches the investigation into the death of two teenagers - a cold case that dates back more than twenty years. The family of the murdered twins sees its wounds reopen. While Sylvain Groud, yesterday's culprit on the brink of delinquency, no longer has anything to do with the loving husband and future father he is becoming, the revelation of his past acts implode his family. Sylvain confesses, hoping to find peace... when Justine discovers that he is protected by the prescription and that he must therefore be released. How, then, can a form of justice be found to appease the families of the victims?