Psychoanalyst Pablo suspects his older brother, José, is murdered after his conference is interrupted with the news of José's suicide; officer Cecilia Bermúdez is frustrated with the senseless cases she has been assigned.

The presence of a copy of Dr Jekyll and Mr Hyde in José's office confirms the connection between the two murders; Cecilia and Pablo draw closer; Laura Hontú begins to search for her son.

The investigation leads Pablo and Cecilia to the Lemos Institute, where Mansilla, the director, tells them the story of Dante Santana; Bruno receives a new threat and decides to take action; Laura's search hinders the investigation.

Mansilla's murder reveals the connection between Dante's victims; Cecilia removes Pablo from the investigation and begins the interrogations to find the killer.

A dig into the past unveils the connection between Dante and José, and uncovers the secret that caused the rift between Pablo and his family.