The squad is called to the scene of a crime whose staging is disturbing. Marius's lies and Roseline's revelations make them suspect in the eyes of the investigators. Jennifer confirms the murder weapon and the result is astonishing.

The population has been worried since an alarming viral video was posted online. Muriel tries to find out who is behind the challenge video circulating on the internet. A leak of information linked to the investigation causes suspicion and anger at HQ.