Court of Greed and Gold by Eliza Raine

The threats are mounting in the Shadow Court, not just for Reyna, but for the mysterious shadow-fae Prince who has kidnapped her. Undead monsters, an insane Queen, magical curses and ancient secrets are all vying for the honor of ending their lives.
Forced to work with the famously monstrous Prince, Reyna soon learns that the fae warrior is dangerously different from the rumors. Passionately, fiercely, different.
And when the stakes are raised, she will discover that he is not the only one hiding who he really is.