Villa Borghese - a huge park in the center of Rome, bigger than the Vatican City and a little smaller than the Principality of Monaco - is a wonderful place. There are museums, theaters, the Casa del Cinema, playrooms, churches. And then the thousands of plants, the waterways and the many animal species hosted at the Bioparco. An enchanting island of greenery. Fascinating, cultured, mysterious. The mayor, sick with love for the Villa, moves heaven and earth to have a police station opened inside. To manage the new office, the police chiefs decide to gather a group of individuals who have certainly not shone elsewhere. Like the magnificent seven, but in reverse. Giovanni Buonvino is called to lead them, a senior inspector who, fifteen years earlier, was condemned to the rear by a burning mistake. "Watch out for the Super Santos balloons," his colleagues joke, "they could contain explosives." A few days after the police station was inaugurated, however, the peaceful routine was interrupted by the discovery of a horribly mangled corpse. From that moment on, nothing would ever be the same in Villa Borghese – bloodied by a long trail of death.