A man is taking a bath in a hotel room when a stranger in a mask forces his head and drowns him under the water. This is Morgane's first case as a consultant for Lille DIPJ, with Kadarec's disagreement. She was reluctant at first, but accepted the post, subject to the reopening of the investigation of Romain's, her boyfriend, disappearance, which Hazan supervises. The PJ discovers that the name of the decease was Benjamin Winckler, he was a regular in the hotel bar and that he was having an affair with Gladys Puger, a Doctor in her 40, who was the last person to see...