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.
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.
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.