US DARK FEW by ALEXIS PATTON

Khalani is a Prisoner
Takeshi is a Guard
Both are slaves to the Underground

Khalani Kanes has never stood on the surface of the earth. In the underground city of Apollo, faith and dreams are as absent as the sun. She longed to visit Genesis, the infamous Domed City and the final place where humanity lives aboveground. But when Khalani is given a life sentence and thrown into prison for a theft she didn't commit, those wishes shatter into oblivion.

In Braderhelm Prison, murderers are neighbors, ruthless and cold-blooded guards live to punish, and every second is a battle to survive. She thought the danger lay in befriending criminals and avoiding Takeshi Steele, the nefarious Captain who runs her cell block. But darker traps and secrets await her within the shadows of imprisonment. Khalani's blood will coat the walls in flaming silk before her enemies let her escape to the surface, a feat no one has successfully achieved. If the reclusive and callous Takeshi Steele won't kill Khalani, then the merciless prisoners and her fractured mind will.

Enter Braderhelm Prison, where only the Wicked remain.