Esther is forced to kill the prime suspect in the serial murders, who had previously served as her scapegoat. She must dispose of the body without arousing the suspicions of Marianne and Milo. The murders are multiplying, and the police, on edge, have run out of solid leads. Removed from the investigation, Célia continues to delve into her past.

Celia travels to her childhood village in search of answers. Esther's Alzheimer's, which is increasingly weakening her, means she doesn't have much time left before the end. Celia then receives a mysterious invitation from "The Cat", who invites her to a final confrontation.