A businessman was stabbed during a round of golf. It is his daughter who discovers his corpse, one Sunday morning. The young woman is suspected by investigators because the day before, she had had a heated argument with her father, who accused her of frequenting a trendy nightclub, known to be the hub of drug trafficking. But Revel and Mélanie soon have another suspect, a certain Antoine Copeau, who is none other than Mélanie's former partner when she worked at Stups. Under a false identity, Antoine Copeau became the manager of the box as part of an undercover operation ...

A young architecture student is murdered in the hall of the Gare de l'Est. The investigation of Revel and Melanie Rousseau tells them that he had been selected among the ten finalists in a large architectural project for La Défense. The favorite of the contest is now Xavier Michel Corbin, a famous architect who seemed to exert a strange fascination for the young man who was murdered.

A deputy mayor of Paris was killed in his car, one evening when he was driving home a young social worker with whom he had just spent the evening. Is this a crime of passion or a political assassination? Revel and Rousseau wonder about the real motive of the killer. But soon, they understand that it is in reality the social worker who was targeted. The murder of the politician would only be a smokescreen intended to blur the tracks and to keep investigators away from a gifted 10-year-old boy, perhaps at the heart of this bloody affair ...

A psychiatrist is murdered while trying to get in touch with his brother-in-law, a schizophrenic hospitalized in a psychiatric clinic. During their investigation, Revel and Rousseau discover that the practitioner was about to denounce a juicy insurance fraud, orchestrated by the managers of the clinic. The psychotic patient may not be the ideal suspect ...

A triple murder was committed within minutes. Vincent Revel and Mélanie Rousseau are responsible for this delicate investigation. Soon, they trace a BAC policeman, a man with personality disorders, who could be the perpetrator of the massacre. This discovery deeply disturbs Revel, and for good reason: he knows the suspect well since it is his half-brother, with whom he has not had any contact for quite a few years. He is shocked to find that this one has the same pathology as their mother ...

Fanny Derrien works in the baggage service of a major Parisian airport. Nothing seems to be going for her: she has problems with her boyfriend, her car threatens to break down on the way to work, and her coworkers keep annoying her. One evening, she does not return home and is found dead in the trunk of her car. After suspecting the victim's fiancé, Revel and Rousseau discover that her colleagues had been harassing her for months, harassment of which she had repeatedly complained to Philippe Galand, her hierarchical superior. The only one she really trusted. However, the latter does not seem to have paid much attention to Fanny's complaints, perhaps too busy covering the luggage traffic organized by her employees within her department ...