Ramón, a respected philosophy professor, has kidnapped Laura, a psychiatrist, and claims to be a serial killer.

As both conversations progress, it is revealed that Laura is Ramón's ex-wife, who accused him of spousal abuse during their divorce hearings.

Ultimately Laura admits to lying during their divorce hearings, but only to save him the humiliation of the truth: that she has discovered his affairs with male students.

During the interview, Ramón admits that he kidnapped Laura in order to scare a confession from her, but his story does not always match up with the events portrayed.

When police secretly inspect his home, they discover a doctored telephone message that Ramón has made from the recordings in his basement.