In this last segment of "Nos bébés ont été échangés," you will discover how the two families are coping with their shocking revelation. Manon will meet her biological mother Létitia and become friends with Létitia's daughter Émilie in the process.

Soon after Claire and Harold move into their new Parisian apartment, strange things start to open. Their new neighbors explain that their new home may have been the scene of a murder. Claire believes it, but Harold remains skeptical. Will they be able to solve this mystery?

Claire and Harold invite their new neighbors for drinks to get acquainted and thank them for their help. As the evening unfolds, the conversation becomes strained and strange things start to happen. Claire and Harold are left with many unanswered questions.

Claire and Harold go to bed exhausted after a long day of moving in to their new apartment. While Harold succumbs to sleep, Claire is wide awake. She investigates some strange noises coming from the living room.

Claire is invited for a cup of tea at Solène's. She ignores Solène's warning about strange noises in her living room, but was this wise? Find out what happens in Claire's apartment upon her return.

Harold and Claire are having dinner when they hear some strange noises in their apartment again. Looking for a rational explanation, Harold asks their neighbors, Bastien and Solène. They seem to think that the apartment is haunted, but Harold has his doubts.

Claire's fears escalate and the situation becomes unbearable for her. She is convinced that the apartment is haunted, while her level-headed husband tries to remain calm, which infuriates her even more... and creates a wedge between them.