It's been 15 years since the disappearance of little Francesca, daughter of the renowned poet and playwright, Vittorio Visconti. The community is stalked by a psychopath bent on cleaning the city of "impure and damned souls". Moretti and Succo are the detectives in charge of finding the killer of these "Dantesque" crimes. Francesca has returned, but she is not be the same girl they once knew.