Karsten Morris is different. As a member of The Agency he's one of their most successful operatives, always claming its luck that brings him through. It's true enough, as a stallion unicorn in full control of his powers, luck is the least of what he's got going for himself. An old race from The Glimmer, he's been cut off from his realm and has lost all hope of ever going home, or finding a mate, an elusive and possibly extinct mare unicorn. Illori Swain is starting a new life. After a horrific ordeal in Africa, being the personal good luck charm for a rogue Fallen Angel, she's determined to put the past behind her and start over, even forget about her own nature if needed. As the last female unicorn left in the worlds, shes resigned herself to the fate her sisters choose. Until one fateful day in Glasgow. Karsten recognizes the mate he thought he'd never find and Illori hopes for a future with foals and love. But nothing is ever cut and dry. Sammael, a Fallen Angel and hunter for Lucifer, is charged with finding and dispensing with the Mare unicorn. Lucifer isn't so forgiving these days, and Sammael is already on thin ice, but when the hunter finds out there's some competition coming from the bowels of hell, his plans have to change. Nybras, Devil of the Maze and Keeper of the Pleasures of Hell is unsatisfied with his role in the mess of things below. When he hears of the new mission Sam is charged with, he takes action. When Nybras gets his hands on Illori, Karsten and Sammael have to create an uneasy partnership in order to save the girl and neutralize the threat to their respective ways of life. It won't be easy, but when is anything ever worth it easy?