In part one of "Le Jour où tout a basculé: Nos bébés ont été échangés" (The Day When Everything Changed: Our Babies Were Switched at Birth), a family is in turmoil. Frédéric is very jealous of his wife Anne-Sophie and accuses her of having an affair with an old flame. Although all the evidence seems plausible, is there another explanation?

Anne-Sophie and Frédéric are at loggerheads and won't speak to each other due to the unexpected results of a paternity test. Anne-Sophie receives some news at the end of the video that suggests the situation will become even more complicated.

Anne-Sophie meets with Fred to tell him the bombshell news about the paternity test results. Will this bring him back home?

The private detective's investigation reveals that Frédéric and Anne-Sophie's daughter Manon was switched at birth with another baby. They are distraught and can't face telling Manon the truth.

Frédéric and Anne-Sophie meet Manon's biological mother Laetitia in a café under the pretext of a survey. Totally unsuspecting, she is in shock when she finds out the real reason for their visit.

While Anne-Sophie and Frédéric have a meeting with Manon's biological mother, Manon carries out her own investigation and finds the detective's report. By the time her parents come home, she's gone, and panic sets in when Frédéric discovers her farewell note.

After running away from home, Manon finally decides to come back, only to be confronted with Émilie, her parent's biological daughter. Fortunately, Émilie manages to rescue the situation and convinces Manon to stay and speak with her parents.

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.

Harold is not convinced that the strange events in his and Claire's apartment mean that it's haunted. He has his own suspicions and is determined to find out the truth.