Louise gets closer and closer to the serial killer when her best friend Lydia disappears. She is also sent to accompany Ketoff to leave France, as he has been asked to do so.
Louise wonders if the war could have turned her brother into a monster. Thanks to hypnosis, she learns that he had fallen madly in love with a nurse, Maria.
Roman uncovers a secret. With a new ally, Louise discovers the place where the killer keeps his victims.
When Fujita, an expatriate Japanese painter, reports the disappearance of his favorite model, Louise realizes that Céleste Dumont is not an isolated case.