The investigators get their hands on a disturbing new element of the investigation that creates a shock wave and turns the investigation upside down. Jeremy's parents began to take steps to reach out to the victims' families.

The noose is tightening and investigators are following the trail of Jeremy's alleged accomplice. Still looking for a motive, Sergeant Boisvert and the coroner are interested in the theory of radicalization.

The police make a major breakthrough and suspect that Jeremy had an accomplice. Charlie's post-traumatic shock increases. She decides to help the investigation and makes important new revelations.

The prints found on the murder weapon put the investigators on a new track. Léa finally confessed to the secret that had been eating away at her. The investigators learn more about Jeremy's intimate life.

The search for clues continues and the interrogations led by Coroner Éliane Sirois and Sergeant Boisvert intensify. One of the victims comes out of a coma and makes an unexpected revelation about the shooter.

A tragedy shakes Beaufort College. A gunman opens fire on the students, killing several before losing his own life.