Catherine Godin never stopped believing in the innocence of her son, accused of murder. 15 years after his conviction, everything changes.

The death of a witness creates a stir in St-Bruno. Was it an accident, murder, or suicide? Did they want to silence her?

The autopsy confirms that the witness was murdered. Bing, a major crime investigator, has doubts about the Parenteau case.

As Bing and Catherine accumulate more and more evidence on Alexander's innocence, the investigation becomes more complex.

Bing and Catherine hit a wall; the BEI accuses them of having manipulated former witnesses, and Alexandre wants to plead guilty.

Bing examines the contents of the boxes of information related to the case that his father had hidden. New suspects surface.

As the noose tightens, Louis Bachand cracks under the pressure and reveals to Catherine what happened the evening of the accident.

After 15 years of sacrifices and disproportionate fights to exonerate her son, will Catherine see the light at the end of the tunnel?