It's about a girl in Scotland, I believe, and she finds out she's really special and she needs to be hidden because people want to take her and use her. (I forget what for; I think her blood is special, but I'm really not sure.) She finds this boy who helps her hide and he has tattoos and Celtic symbols on him and they end up falling in love at the end.
I think there are 2 or 3 books and every book is a Celtic symbol.
