Season 3 of Master Crimes continues its blend of crime procedural and character drama, following criminology professor Louise Arbus as she and her students assist the police with complex investigations. Played by Muriel Robin (Captain Marleau, Call My Agent!), Louise uses sharp psychological insight and unconventional methods that often put her at odds with standard procedure. She works closely with police detective Barbara Delandre (Anne Le Nen, Antigone 34) who represents the official investigative side.

This season introduces a more personal storyline involving Louise’s estranged son Guillaume played by MHz favorite Nicolas Gob (The Art of Crime, Riviere-Perdue). His unexpected return disrupts her life as he becomes entangled in a serious situation that draws suspicion and raises unanswered questions. Faced with uncertainty about his actions and motives, Louise is forced to confront the limits of her objectivity. As she looks deeper into his circumstances, elements emerge that suggest he may be caught in a more complex situation, testing both her professional judgment and her role as a mother.