Laurence Malenfant, a young policewoman, shoots a witness who has just made an important revelation about the disappearance of her father.

The BEI discovers that the man who was shot by Laurence during the police intervention was in possession of a compromising video.

Laurence and Geneviève have reason to believe that Philippe has information about the disappearance of Jean-Claude Malenfant.

Although the BEI has accumulated a great deal of evidence, new information will muddy their waters and the course of the investigation.

Two things link the victims found on Île Notre-Dame: being a police officer and leaving a suicide note after their disappearance.

The media are aware of the circumstances surrounding Poupart's death. Corbeil discovers Philippe Laberge's dark secret.