Twelve kings - Bradley P. Beaulieu

In the cramped west end of Sharakhai, the Amber Jewel of the Desert, eda fights in the pits to scrape a living. She, like so many in the city, pray for the downfall of the cruel, immortal Kings of Sharakhai, but she's never been able to do anything about it. This all changes when she goes out on the night of Beht Zha'ir, the holy night when all are forbidden from walking the streets. It's the night that the asirim, the powerful yet wretched creatures that protect the Kings from all who would stand against them, wander the city and take tribute. It is then that one of the asirim, a pitiful creature who wears a golden crown, stops eda and whispers long forgotten words into her ear. eda has heard those words before, in a book left to her by her mother, and it is through that one peculiar link that she begins to find hidden riddles left by her mother.
As eda begins to unlock the mysteries of that fateful night, she realizes that the very origin of the asirim and the dark bargain the Kings made with the gods of the desert to secure them may be the very key she needs to throw off the iron grip the Kings have had over Sharakhai. And yet the Kings are no fools-they've ruled the Shangazi for four hundred years for good reason, and they have not been idle. As eda digs into their past, and the Kings come closer and closer to unmasking her, eda must decide if she's ready to face them once and for all.