The body of a young man is found in an abandoned factory in the center of Madrid. The body is naked and has a Y-shaped scar, as if the autopsy had already been performed. Inspector Mario Carrasco goes to the scene with Macarena Valverde, the sub-ins...

The body of a young man is found in an abandoned factory in the center of Madrid. The body is naked and has a Y-shaped scar, as if the autopsy had already been performed. Inspector Mario Carrasco goes to the scene with Macarena Valverde, the sub-inspector who joins the Unit that same morning. On arriving at the Forensic Anatomical Clinic, Dr. Leal is horrified to discover that they are two different corpses, killed with the same modus operandi. Everything becomes more complicated when the bodies are reopened, with the discovery of something that should not be inside their bodies and that the killer has put there.

The police receive the detailed autopsy reports of the two young men hours before Dr. Leal completes them, thus determining that they can only have been performed by their killer.

When the police finally find a common link between the two boys, a third corpse turns up in an abandoned photography factory on the outskirts of Madrid, with the detailed autopsy report, long before Dr. Leal can perform it himself.