The unexpected arrival of Esther's daughter, Marianne, and her grandson, Milo, at her home for a few weeks, hinders the execution of her revenge. Celia discovers that the serial killer is leaving messages for her on the victims' bodies, but she doesn't understand their meaning.

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.