Legendary detective Guardia is forced to work with Jonas, a recent Forensic Science graduate, to find the culprit in a fresh murder case. Despite their differences, they band together, only to discover the case is bigger than they thought.
Garcia, in a desperate attempt to catch the Marquesa killer, lets himself be led by the wrong clues. Guardia, trust his experience to guide him. The agency's instruction is clear: they must set their egos aside, and work as a team.
Guardia and Garcia are after a murderer killing public officials. Guardia leaves the case in Garcia's hands to focus on old evidence from his parents' murder case. Garcia comes too close to the killer, putting himself at risk.
Blinded by newly uncovered clues, Guardia travels to Cd. Jimenez, convinced his uncle killed his parents. Garcia, still dealing with his close encounter with death, questions if the path he's chosen is right for him.
Guardia becomes obsessed with linking his parents' killer with the one that terrifies the city. Garcia figures this out and is determined to prove him wrong. Both the Velasco and Silva-Carrillo agencies try their best to catch the new killer.
Rodolfo makes lieutenant Lorenzo a generous offer. Guardia tells Sofia the truth about his need to be close to Regina, while Fernando, the killer, has two new victims in mind: Lucia and Regina Guardia.
Guardia suspects Rodolfo is not just the killer they're now looking for, but also his parents. Garcia cannot make sense of Guardia's conclusions, but by the time he realizes his mentor suspects Rodolfo, it might be too late.
Salgado breaks out of prison and kidnaps Guardia's daughter. Garcia, Diana and Lorenzo follow the killer's footsteps, only to find out he was working for Salgado all along, and they've all fallen in his trap.
