Stéphane Colin, a businessman who seems to succeed in everything, is in fact riddled with debt. One day, his wife and two daughters mysteriously disappear. Revel and Rousseau, put on the case, fear that, pushed to the limit, Stéphane has kidnapped them himself, perhaps even murdered in a moment of bewilderment. But soon, a demand for ransom reaches the grieving father and husband. The kidnapping appears to have been orchestrated by people determined to secure a large sum of money from the one they believe to be millions rich. The situation is straining. Will Revel, Rousseau and the others succeed in saving Stéphane Colin's wife and daughters? ...

A woman is found dead in her apartment. Her son, just released after serving a prison sentence for the murder of a 15-year-old girl, is the ideal culprit. But during the investigation, Revel and Rousseau learn that the mother, after struggling to prove her son's innocence, had recently changed her point of view. She had opened up to Renaud, the man who had arrested her son, and who also happens to be Revel's former partner in the Versailles criminal squad. The case requires tact and discernment to be clarified ...

A hard-working woman, Alice du Pomeuil owns a prestigious hotel in the center of Paris. Julie, her only daughter and future heir to the establishment, is engaged to Martial Jacquin, a financial analyst in a major investment bank. However, her mother does not seem to take a very favorable view of her daughter's future union. Following an altercation with her daughter, she is found dead in her suite… Alice du Pomeuil was murdered by injecting a lethal dose of Botox. During their investigation, Revel and Rousseau discover that Julie suffers from a psychological disorder which makes her particularly vulnerable to anger. Could she have murdered her own mother in cold blood? Did she act alone or was she manipulated?

A deputy prosecutor in Paris has received death threats. He must now remain cautious. It was by a miracle that he narrowly escaped a parcel bomb which seriously injured the clerk. Revel and Rousseau are immediately placed on this matter. They quickly suspect the deputy's wife, a renowned lawyer, of having pressured a former convict to get rid of her husband, from whom she cannot part without having to pay a heavy pension. Unless the case hides a much more perverse manipulation. Revel and Rousseau are lost in conjectures ...

The corpse of a young woman who has been missing for twenty years is found in the Seine. With this macabre discovery, the investigators resume an investigation that has haunted Revel for years: the disappearance of this young woman, twenty years earlier, was one of his first investigations. Their research leads them to Joël, a somewhat "lost" man whom they suspect of having acted with an accomplice, Jean-Christophe Baillard, a brilliant engineer, friend of Joël during their years of study… twenty years more early on, who actually happens to be a dangerous psychopath.

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.