Savigny and Revel investigate the death of Malek Kelkal, a man who has just been released from prison after ten years in detention for robbery. In the victim's pockets, they find two clues: a note that smells of ammonia and a fashion brochure bearing the symbol of a unicorn ...

An argument explodes in front of the Saint-Eustache Church between two homeless people who accuse each other of having stolen the money from the collection. They are separated by Maurice Bossart, one of the sacristans. Alerted by the noise, Father Roche also intervenes to calm the situation. Later that evening, one of the two homeless, Thomas, returns to the church, grabs a broken bottle and kills Bossart ...

A band of brigands organizes the robbery of a famous jewelry store on the Place Vendôme. In their wake, they leave the corpses of two teenagers and that of one of their accomplices, Matéo, a computer expert.

Since the death of her husband, the very wealthy Madame de Gersant has lived alone. Alex, his only son, is trying to get off drugs with his pregnant girlfriend Nina. But fate hangs over the couple when Nina is killed and he is the main suspect ...

After the disappearance of his wife Valérie, the cosmetic surgeon Pierre Clément went to the criminal section to report this disappearance. Savigny and Revel are put on the investigation and begin by questioning Valérie's sister, Juliette. It does not take long to reveal to investigators that her brother-in-law is not what one can call a model husband ...

Alerted by an intern, Savigny and Revel investigate three strange deaths. Suspecting at first an "angel of death", the investigators review their copies when they discover that it is about a traffic of capsules. They seek to corner the criminal by all means to avoid a cataclysm in the French public health system ...

Benoît Bouvier died mutilated in the room of a large Parisian hotel. During their investigation, Revel and Savigny discover that he had a relationship with a woman whose husband he had defrauded, as well as another couple. The latter would then have ordered the murder for revenge ...

A renowned obstetrician, whose practices do not appeal to a religious organization, is shot dead in front of his family. The investigators then orient themselves on the trail of a killer who attacks exclusively doctors performing abortion. They are far from imagining that this assassination hides a vendetta towards those whom the killer considers responsible for the death of his son, 6 years ago ...