I've had this feeling all day because I can't figure out what book I read this storyline in. Basically, there's a girl, a princess I think, who is someplace that's not her home, then something happens (Can't remember what exactly) and she's taken away to safety by someone who appears to be a friend, but instead abducts her (Might have been 2 people actually).
That's all I can remember, also there might have been a giant somewhere in there too. It's really vague I'm sorry.