A woman is found murdered. All the DNA evidence collected at the crime scene converges on a suspect, in prison at the time of the facts. Astrid and Raphaelle quickly understand that they must be dealing with a serial killer.
A biologist who studied plant intelligence is discovered dead in a tropical greenhouse. She had left a research lab years before her murder, possibly connected.
A woman accused of killing her Alcoholics Anonymous sponsor is determined to prove her innocence. She reaches out to Astrid and Raphaëlle, who will do anything to help her.
A man has a fit of delirium after being drugged and defeating himself at an auction. Astrid and Raphaelle set out on the trail of a precious manuscript.
William's brother, president of the autistic association Astrid frequented, died suddenly. The embalmer in charge of his body claims he got up and fled; Raphaelle is sure he's storytelling, but the case escalates when a new corpse is discovered.
The lifeless body of a young man is discovered after the collapse of an underground gallery. Despite appearances, the scientific analysis is clear: the corpse is that of a man over 80 years old.
A retired murderer is found dead in his psychiatric hospital room. Astrid and Raphaëlle will soon find out that it's a rather well thought-out organized crime from within the hospital.