The investigation brings to light the dark side of Fran’s life: he had established contact with some mysterious person in Holland, and he had an affair with an unknown lover. Did Fran die because he was involved in some shady business? Or was it a crime of passion? Both Candela and Díaz make progress in their respective investigations, carried out independently. Díaz believes Fran used his contacts from the milieu of a dangerous drug smuggler. And Candela makes an uncomfortable discovery – Fran’s mysterious lover is someone very close to her.

The murderer, upon being found out, kills Reyes. From that moment on, he faces the difficulty of getting rid of the body in an island like El Hierro, where it is difficult to vanish without trace. Especially after the disappearance of the local police officer gives rise to a public outcry. There is a reaction in the island. Police forces, civil defense services and volunteers start a desperate search. The most likely scenario is that the murderer Reyes was investigating is back in action. Candela is devastated; she feels guilty because she is the one who enlisted Reyes for an investigation that strictly speaking was not part of her work duties.

The hearing for the custody of the girls is launched after the delay caused by the disappearance of one of them.

A murder sets in motion the investigation led by Candela and Sergeant Cruz. Diaz, who believed he had solved his problems, soon discovers how wrong he was.