An island prison

Volya Angelov, dubbed the Priest by the general population due to his cult-like following, is skilled at negotiating and taking what is rightfully his. He has been stealing Gorod Krestov's fortune for years, and he and his criminal masterminds are gradually depleting the city's impoverished neighbourhoods with their gains.
But Mysh, a five-foot-five girl who is his closest buddy, inherits his kingdom after he is taken into custody and sent to an island prison. She has to take care of what's left of him and determine if risking the syndicate for his life is worth it.
Can Mysh pull it off, though, with dangerous personalities converging all around her and demons from a terrible past?