I kind of can't believe these books are marketed to kids. In book one they're made into gladiators in a fight to the death arena. In this book (spoiler warning) we learn that one actually killed her own father. Then when they got imprisoned again, by an apparently loving mother my son literally broke down sobbing and hurled three book across the room.
Seriously bloody violent books. A bit rough on me even, and I spent most of my teens reading Stephen king and vc Andrews. Actually... It pretty much is a sex free vc Andrews with dragons. Really not a kids book. Ymmv.