A Witch's Sin (Neon Ghosts Book 1) by Daniel B Greene

What would you do to keep your dreams ad-free? Bruised, stoned, and still adjusting to her latest wear implants, apprentice enforcer Taya Mint plunges into the darkest depths of Megastructure Seven Zero Three, challenging everything she thought she knew about life within the walls she has never stepped beyond. With only one assignment left to earn her full license, Taya finally stands a chance to rebuild a life wounded by grief. But soon she discovers the kidnapping she's investigating is just a piece of a puzzle, one that leads to grisly death and the greedy heart of power within the structure. When evidence points to a supernatural threat as the culprit, Taya finds herself needing to rely on cold-blooded allies just to survive the hell that is Seven Zero Three. In order to save an innocent life in a world polluted by zealots, Taya will have to learn just how much it costs to face the monsters that occupy humanity’s artificial Eden.