Following the discovery of Marilou's corpse, the Squad mobilizes to support Renaud. Although the investigation is the responsibility of Sergeant Guillaume Pelletier of Crimes against the person, our quartet is also helping to find the murderer. Pascal, Stéphanie's son, returns to Quebec after several years. His return will revive a lot of emotions in Stephanie. At HQ, the Squad welcomes a new psychologist and criminologist, Pénélope Roy, who does not leave Dominic indifferent...