
The collateral effects of an unforgivable act committed by Jeremy, a 16-year-old teenager. With the help of the coroner psychiatrist in charge of the investigation, his mother tries to understand how her son, a seemingly problem-free boy, could have ended up committing a heinous act. What triggered this nightmare? When did everything change? Together, the two women make it their mission to unravel the mystery of Jeremy.

Tragedy strikes at Beaufort College when a gunman opens fire, killing several students before taking his own life; the lives of the killer's family fall apart as they try to understand what could have led their son to commit such a brutal attack.

Tensions continue to rise at the Tremblays, as Lea, Jeremy's sister seems to be harbouring some secrets.

The fingerprints found on the murder weapon set the investigators on a new track; Lea finally confesses to a secret that's been eating away at her; the investigators learn more about Jeremy's personal life.

The police make a major breakthrough and suspect Jérémy had an accomplice; as Charlie's post traumatic stress gets worse, she decides to help with the investigation and reveals some new and important details.