A horribly disfigured corpse is found in a Seville city dump. Senior Police Inspector Javier Falcon begins an investigation, but the next day, in the bleak Cerezo apartment building, in the basement of a mosque, an explosion is heard, destroying a section of a residential building and part of a kindergarten nearby. The corpses of children, adults, wounded, maimed - in such a situation, the senior inspector switches to searching for the organizers of the terrorist act. Spanish and British intelligence and the CIA are joining the investigation. But it was Javier Falcon who solved the crime, suggesting that the explosion was not the work of Islamic terrorists, but one of “our own”...