I found this book to be confusing, especially at first, and I suspect many younger teens in particular would too. Eventually I realized that was the point - (view spoiler)[the little hints here and there show that Briony is confused and an unreliable narrator. (hide spoiler)] Once that was realized, it made me want to read to the end, but it didn't really lessen the confusion. I guess I just like things laid out more clearly, and so this isn't the type of book for me. 
 It was well-done, though, how it all came together. Good for readers who liked Going Bovine, stylistically.