Rigus is the brilliant capital of a powerful empire. The low city is a fetid ghetto, a hotbed of vice, in which the dregs of society live among the garbage of civilization. But everyone living in the Empire remembers the Black House, where the most powerful punitive force on the planet is located. Once upon a time, the Overseer was the best detective of the Black House, an agent of an elite unit. Now he is one of the inhabitants of the Low City, a criminal and a drug addict, not sparing anyone who stands in his way. However, when ritual murders begin in the capital, stealing from the victims not only life, but also the soul, and from the void between the worlds, from the very hearts of the abyss, a mysterious monster appears, it is the Watcher who will have to resist Evil...