Nightingale

Milena Errin is the darling of the World Supernatural Control Agency. She's their technology director, and she's frighteningly good at her job. She's led hundreds of missions to success and trained even more agents to use and operate her programming to aide in their operations. She's human among a melting pot of creatures working to find a harmony between humanity and the supernatural.
Lenore Nightingale is the Captain of the Unseelie Court guard, ruthless and sadistic beyond belief. He leads the most terrifying army the Unseelie court has seen in nearly three centuries, and has earned spot his with blood, sweat, and three years in a Seelie prison worse than Hell itself.
A majority of the Unseelie are not happy that their Queen has agreed to end their malevolence toward humanity, and a rebellion larger than any the court has ever seen has risen. The Queen loathes Milena, deems her a threat to the court, but she may be the only person able to help take down the rebellion for good.