THE DARK MIRROR is the first book in Juliet Marillier's Bridei Chronicles.
Bridei is a young nobleman, a fosterling of one of the most powerful druids in the land, Briochan. All of Bridei's memories are of this dark and mysterious man who seems to be training him for a special purpose he will not divulge.
But, everything changes when on one bitter MidWinter Eve Bridei discovers a child on their doorstep--a child abandoned by the fairie folk. In order to avoid the bad luck that seems to come with fairie folk, all counsel the babe's death. But, Bridei follows his instinct and, heedless of the danger, fights to save the child. Briochan, though wary, relents.
As Bridei comes to manhood, and the foundling Tuala blossoms into a beautiful young woman, he begins to feel things he didn't know were possible.
Briochan sees this and feels only danger, for Tuala could be a key part in Bridei's future or could spell his doom."