The investigation begins when a convicted murderer, , is found suffocated in his room at a psychiatric hospital. Although Lebel was under constant guard and physical restraint, the security guard insists no one entered the room.
: The episode is described as "playfully subverting" detective fiction conventions. While the solution is slightly implausible, the convoluted investigation keeps the audience engaged. Astrid e RaphaГ«lle s03e04
The case draws the attention of , a writer turned serial killer from Season 1, who remains a nemesis to the duo. Lamarck hints that Lebel's death was not natural, leading Astrid and Raphaëlle to uncover an organized crime network operating from within the hospital. Critical Review The investigation begins when a convicted murderer, ,