Black abyss (Welcome to Sin city.) BOOK: 1

In this world, there is a place where people who don't go to heaven and hell thrive in. Its called sin city, this place is where multiple sinners live and interact with each other. The most major rule of this place is ANYTHING GOES and all the crimes are legal. Though there's something that's makes you wonder about this place, who are the people? How did they end up here? And why did they die?
What exactly happened?