Court of Monsters and Malice by Eliza Raine

Reyna’s friends were supposed to be safe in the Shadow Court, but she has enemies everywhere. And unless Mazrith forgives her, he will join that number.
As hard as she wishes it were not true, Reyna’s desire for the Prince grows as fierce as her need to win the games and find the staff that will set him free.
But she’s about to find out who he really is, and what he has been keeping from her – and that will change everything.