In the police archives department, Commander Raphaëlle Coste meets a woman with an immense knowledge of all criminal investigations.

Inspector Raphaëlle and her partner, Astrid, are intrigued when a lawyer collapses in the middle of a courtroom; the investigation leads them to a house where supernatural phenomena take place.

The investigation into the death of a lawyer leads to a haunted house and a new body; the duo uncover a horrific multiple murder where the perpetrator has been locked up for decades.

An employee of the Natural History Museum is found dead near a dinosaur skeleton; Raphaëlle and Astrid investigate what lies behind this bizarre crime.

A famous writer is found dead -- poisoned -- and Raphaëlle is convinced it is murder, even though the man's flat is locked from the inside; Astrid and Raphaëlle enter the world of publishing to investigate.

The lifeless body of a young man is found when an underground gallery collapses but analysis shows it is the body of an elderly man; Astrid and Raphaëlle discover that the man is an alchemist.