A naked corpse, devoid of any signs of violence, is found tied to a bed in a roadside motel. Sergeant Rubén Bevilacqua (Roberto Enríquez) of the Central Operational Unit of the Civil Guard (UCO) and his assistant, Virginia Chamorro (Íngrid Rubio), are tasked with investigating the death. They soon discover that the deceased was Trinidad Soler, an ordinary man with a wife and two young children, highly regarded for his work at the nuclear power plant. Was it a natural death due to excess or murder? The case doesn't seem straightforward at all.