Geminis have a close spiritual connection. That is why they very subtly feel the state of each other. If one of the twins dies, the other does not find a place for himself. The main character of this book "The Kingdom of Sin" got into such a situation. To punish those who killed her sister, she begins her journey of revenge. And it is difficult to even imagine what awaits those whom she will be able to find.

Twins Vittoria and Emilia among people live secretly, carefully hiding their secrets from others. The fact is that they are members of the family of hereditary witches. Hence their secretive lifestyle, as well as their unwillingness to communicate with others. Despite this circumstance, their family owns a Sicilian restaurant. One evening, an unusual incident happens: Vittoria does not go out to a traditional dinner in a family restaurant, which cannot be in principle.

Going in search of her, Emilia finds her sister murdered, and her body desecrated. The girl is barely alive from grief. She vows to find her sister's killer. To do this, she has to resort to dark magic, which is banned. Emilia gets in touch with Prince Wrath's six brothers and with himself. These seven brothers represent the seven sins and therefore rule Hell. The Prince of Wrath is ready to become an ally of Emilia and help her find the killer, but what price is she willing to pay for it? Also, can a carrier be trusted to the hell of human souls? Emilia does not know the answers to these questions but is ready to do anything in order to commit revenge.