Audrey, unica sopravvissuta ad un serial killer 16 anni prima, è convinta che costui sia tornato ad uccidere. Per dimostrarlo sarà costretta ad affrontare i suoi demoni e le sue bugie.

Audrey, occupandosi del caso di Madeleine, la ragazza uccisa con lo stesso modus operandi di Itsas, scopre che frequentava alcuni siti d'incontri dove adescava uomini sposati.

2003: Audrey tries to convince herself that Cortez is indeed Itsas' killer and to forget everything. 2019: The prosecutor seeks to remove Pauline from the investigation.

2003: Audrey comes to Elaura to apologize for her crisis during the bachelor party. But someone is lurking around the house where Elaura lives. 2019: In police custody, Patxi finally admits he was Maialen's boyfriend but claims to be innocent of her murder.

2003: Audrey is committed to a psychiatric unit. She tries to call Joseph to tell him the whole truth about the night of her assault. 2019: Ana confronts the man she met through the app.

Maialen's final moments are revealed.