Childless partners writer Andrei and musician Olga adopt the eight-year-old Ksyusha. The supervisor of the orphanage where the woman was raised is Andrei Iren's ex-girlfriend. She still passionately likes Andrei as well as means to return him whatsoever costs, even if for this he will have to destroy his family members happiness. Meanwhile, Andrei is writing a science fiction novel regarding the dark side of Petersburg. On the pages of his publication, the city on the Neva turns into a phantasmagoric globe, where time itself has quit, and also the streets are inhabited by cruel creatures. Instantly, Ksenia goes into the world of "dark Petersburg" from the novel by Andrey, where he fulfills a mysterious good friend Paramon. Heroes are waiting on several harmful experiences ...