Created by Daniel Écija and produced by RTVE in collaboration with Globomedia and Good Mood, it premiered on 7 September 2017 on La 1.

Andrés Vargas (Roberto Álamo), a police officer, dies during the pursuit of a serial killer.

Given a second chance, he comes back to life, but 5 years after his death is incarnated into the body of another police officer, Manuel Márquez (Javier Gutiérrez).

He teams up with Vargas' daughter Susana (Anna Castillo), who does not suspect Márquez's real identity, and with 'El Enlace' (Alejo Sauras) in facing the killer, who has resumed their activity.

[3] In December 2017, Amazon purchased the rights for the distribution of the series in Spain and Latin America as part of its SVoD service.