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.

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.

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

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.

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?

Vanessa is coming over to Sybille's house, which is now Benoît's as well. They don't need to spy on each other anymore, but Vanessa is bringing her binoculars anyway. As for Édouard... justice has prevailed.

Édouard's life is starting to unravel as the awful truth comes out. Benoît makes some startling revelations to Sybille, but she is not entirely surprised. It's not all gloom and doom for her, however, as an old flame is rekindled between them...

Sybille finally finds an opportunity to knock on the door of the stranger who has been spying on her for weeks. She braces herself and confronts the stranger.... Or is he a stranger? A pleasant surprise is in store for her.

Sybille and Édouard meet for drinks at Vanessa's apartment. Vanessa finally admits that a tenant lives with her, but he remains elusive. Vanessa's dubious explanations do not satisfy Sybille and only add to her curiosity.

Sybille and Édouard are still at odds with each other as Sybille now accuses him point-blank of having an affair with Vanessa. The mysterious neighbor doesn't cooperate with Édouard's scheming but pursues her own agenda.

Sybille's anxiety escalates as the spying continues. The stranger across the street is staring out the window all day long. To make matters worse, her husband comes home late, very late, and is less than sympathetic to her plight...

Sybille is concerned that the man she's been spying on is now watching her. Undaunted, she walks across to his apartment building to investigate. But she is stopped in her tracks, and things don't go according to plan.

In this episode of "Le Jour où tout a basculé" (The Day Everything Turned Upside Down), Sybille, a bored and lonely housewife, has developed the peculiar habit of spying on her neighbors across the street, much to her husband's dismay.

Enzo could not be happier. At last, he is reunited with his father, and his sister!

Enzo and Brice have an unexpected visit from Murielle at the café. After eavesdropping on their conversation, she walks up to them and calls out Alain's name, hoping that Brice will respond and reveal his true identity. Instead, Brice draws a blank face and flees the scene.