Delphine Cormier is a fairly average teenager until one day, a life-changing incident lands her in a therapist's chair every Tuesday afternoon. But it isn't the chair or it's owner that has her slowly opening up, it's the girl who always comes prancing out every Tuesday before her.

On holiday with her father in the south of France, Cosima stumbles across the beautiful, scientific Delphine and they instantly have a connection. Cosima's convinced that she's found not only her intellectual equal, but the future mother of her children. Amazingly enough, so has her father - Delphine's mother.