Three police officers. Love, jealousy, control, lies, manipulation and - betrayal. A murder. Two versions. Only one truth. Known as the Guardia Urbana Murder Case, it has caused great commotion in recent years in Spain. A murder that has all the ingredients of a top thriller, but whose characters and settings are real: Rosa, Albert and Pedro, Vilanova i la Geltrú and Roda de Berà are not invented names, nor is the story, although at times it is hard to believe it is true. The first episode of this miniseries outlines the facts of the case. On 4th May 2017,investigators receive the alert of this car on the side of a mountain track near the Foix Reservoir. Inside the vehicle, the Mossos d’Esquadra Police find the charred remains o fa body. Due to a prosthetic back replacement which the fire did not melt, the investigators are able to identify the victim Pedro Rodríguez, a local policeman for the Guardia Urbana in Barcelona. But the fire eliminated all traces of prints and clues, making it impossible for the investigators to even define the cause of death. The evidence leads the police to investigate two suspects: Pedro’s girlfriend, Rosa Peral, and her lover, Albert López, also police officers. Initially, both deny the facts, but they will end up mutually accusing each other, bringing to light the intimacy of a love triangle that ended in tragedy.