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 ...

A father is assassinated during the eighteenth birthday of his son. During their investigation, Revel and Rousseau discover that he was in the midst of divorce proceedings with his wife Julie and especially in the midst of a dispute over the custody of their children. Convinced that little Sophie, her daughter, was sexually abused by her husband, Julie had asked one of her friends, Doctor Chauveau, a psychiatrist specializing in criminal affairs, to intervene in order to make the child talk. She does not know that she brought the wolf into the fold and that the psychiatrist had her ex-husband killed in the mad and pathetic hope of conquering her.