A Vision of Air - Three Realms, Nine Monarchs, #1

A sinister magical plot could destroy order in the Nine Monarchies. Foiling that plot could destroy something even more precious. The only seer born to the bird folk in seven generations, Fionn has spent his entire life in an impenetrable, remote abbey, learning to control his visions and to heal the sick. He has never met his parents, has never even seen another of his people, and has never known anything beyond the strict order within the abbey walls.
When Kiernan, the half-human son of the forest Sidhe, is sent on a secret mission to the abbey, he finds himself trapped within the walls. He is blinded, weakened, and stripped of his magic-and forced to rely on seer-healer Fionn for everything. To the Sidhe, the bird folk are lesser beings, thought to be barbaric and barely civilized. But Kier doesn't know Fionn is one of them, and he finds himself attracted the gentle young man he can't even see.
When Kier remembers his mission to foil a plot that threatens both his life and Fionn's, he has to choose: save the young man he is coming to care about, or carry out the vital mission he was sent for, even if it means losing Fionn.