A gruesome discovery forces Fortier to embark on a descent into the hellish mind of the psychopath Thétreault. Nothing reassuring for her SAS colleagues, who are confronted with a man who mumbles and an old woman who falls from the sky.

Frappier's aggressiveness forces Fortier to adjust her communication techniques. The situation worsens as investigators desperately search for a witness in the deserted neighborhood.

The SAS detectives are trying to find the missing link in the Tupper Street murder series. Meanwhile, Fortier focuses on the only potential witness, a young boy with many secrets.

A 5-year-old child disappears from his home. The SAS (Special Administrative Section) is on the case, but investigators find no trace of the missing child

Suspects are lining up in the case of the missing child. It's up to Fortier to uncover what this strange family is hiding. What's going on? Runaway? Kidnapping? Murder? Anything is possible.

The psychopath Tétreault is harassing Fortier, and the SAS officers are worried about their psychologist's mental state. Johnson tries to intervene without Fortier's knowledge, but a strange incident forces the squad to flee the city in a hurry.

A bloodthirsty monster haunts the forest surrounding an Indian reservation. While investigators grapple with unfamiliar customs, Fortier tries to understand the parallel universe of a very particular culture.

With her back against the wall, Anne Fortier takes a desperate gamble and decides to direct the investigation deep into the forest. The longer it goes on, the less likely it becomes that her missing colleague will be found safe and sound. At the risk of offending the Native American communities of the nearby reservation, she sets out to confront the bloodthirsty aggressor on his own territory. Fortier is then confronted with phenomena that her scientific training would lead her to describe as "supernatural." This harrowing investigation, where the paranormal gradually overrides reason, seems destined to seal the fate of the SAS members forever.