Astrid and Raphaelle investigate a crime committed in the middle of the Gare du Nord train station in Paris. The only witness to the incident was the victim's son, Jules, a 12-year-old autistic boy.

The body of a man of Iranian origin is found charred in his home. Spontaneous combustion or diabolical crime? Astrid and Raphaëlle quickly discover that he was living under a false identity….

A serial killer repatriated by plane under Raphaëlle's supervision dies during the flight, the victim of a mysterious decompression accident. Helped by Astrid on the phone, Raphaëlle finds proof that it is an assassination and that the culprit is among the passengers...

Raphaëlle is found, with amnesia, at the wheel of an accident car, the body of a man shot to death beside her. Guilty or innocent? It will take all the talent of Astrid and Nicolas to help him untangle the tortuous thread of events...