S4·E3 Penicillium Brevicaule

As her children compel her to contact the other potential fathers of her child, Morgane is called to a new investigation: Antoine Broussin, an 85-year-old crime novelist, is found dead in a secret room in his home. The investigation becomes complicated when Marie Besnard, an acquaintance from Morgane's time in prison, becomes the prime suspect.