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It all starts when investigator Lera and antiques appraiser Daria, who is accidentally drawn into the investigation, find out the reasons for the murder of a young man. The girls discover the secret of the existence of the Shadow World. It is a representative of a community hidden from people who lifts the veil of the existing laws of the universe. A resident of the Shadow World tells the girls about the purpose of the Raven's Blood ring. It is the key that creates portals to other worlds. All these discoveries allow Daryna and Lera to move forward in their investigation. They find the killer of a young girl. A dark magician performs rituals with the Blood of the Raven ring to open a portal to Hell. Valeria organises a special operation to identify those involved in the murder, but is careless and ends up being captured by the dark wizard.