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 noose tightens as investigators follow the trail of Jérémy's suspected accomplice; Sergeant Boisvert and the coroner pursue the theory of radicalisation.