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 ...

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? ...