In 2003, 19-year-old Audrey and her boyfriend break into a house and take a valuable necklace. In 2019, 35-year-old attorney Audrey learns that a young girl has been found dead wearing an expensive unidentified necklace.

In 2003, the investigation leads to a suspect: a convicted sex offender. In 2019, Joseph, the captain of the local crime squad in 2003, orders Audrey to drop Maialen's case, but Audrey finally tells him the truth about the necklace.

In 2003, Audrey and Joseph share a passionate love affair, even if they have to meet in secret. In 2019, when Pauline has a fainting spell, the prosecutor tries to take her off the case, but she suggests cooperating with her father.

In 2003, while Audrey's best friend is missing, the truth comes out about Audrey and Joseph's relationship. In 2019, Patxi finally cracks under police questioning. Later, Pauline is put on sick leave, and Joseph takes over the case.

In 2003, Audrey is locked up in a psychiatric ward. She breaks out and starts stalking Joseph, his wife, and their daughter Pauline. In 2019, Ana's meeting with the disturbing guy goes horribly awry.

In 2003, the night of Maialen's death unfolds. In 2019, Audrey is just about to return to Paris, when the truth hits her. However, before she can alert Joseph, she is abducted.