Marcus Didius Falco and his laddish friend Petronius find their local fountain has been blocked by a gruesomely severed human hand. Soon other body parts are being found in the aqueducts and sewers. Public panic overcomes official indifference, and the Aventine partners are commissioned to investigate. Women are being abducted during festivals, with the next Games only days away. As the heat rises in the Circus Maximum, they face a race against time and a strong test of their friendship. They know the sadistic killer lurks somewhere in the festive streets of Rome preparing to strike again.