Legendary forensic detective Alfonso Guardia has solved some of the most gruesome murder cases ever recorded. Now in his early sixties, he is haunted by the memory of his parents' killer and the guilt of leaving his wife and two daughters behind. Guardia has fallen into a deep and psychological downward spiral. The director of the Silva-Carrillo Forensic Agency, Rodolfo Silva has decided to bring in some help by recruiting a new partner for Guardia, in order to help him with the load of chilling cases that come in every day. The chosen one is Jonas García, a promising and talented young student from the University of Forensic Sciences. Guardia is unwilling to become García's minder, and Garcia is eager to catch the opportunity of a lifetime, working side by side with the best forensic detective in the country. Both prove to be an unlikely but effective duo in the long, dangerous road to darkness.