"The Stolen Child" by Keith Donohue is excellent. My favorite types of books are those that are wholly believable with elements of the fantastic woven in. (I don't like fantasy or sci-fi b/c it's too hard to continually suspend disbelief.)
This book is masterful. It was presented to publishers as a "bedtime story for adults," if that tells you anything!
The story revolves around a fae (or goblin) who changes places with a human. Yeah, I know changelings sound a bit off the deep end, but I swear it's on the cusp. Honest! Would I lie to you?
I find the whole myth intriguing. The theory is that it was born out of the fear of parents' who were incapable of caring for children with a failure to thrive. Fascinating, aye?
In any event, you follow both the life of the changeling and the parallel life of the boy who becomes a goblin. Really wonderful, heart-wrenching, non-hokey stuff. Excellent story-telling on the author's part. I highly recommend it!