These books are all at a 4th grade RL or higher and have more complex plots and vocabulary as well as climactic situations that are suspenseful and possibly violent. As with any book, I recommend that you read it first or read as much of it as you need to to determine whether or not it is appropriate for your child, especially if you have a sensitive or anxious child. I know that this is obvious and most of you know it anyway, but it's another opportunity for me to encourage you all to read what your kids read - at least some of it!
City of Ember (Books of Ember Series #1)
Edge ChroniclesFrom the Mixed-up Files of Mrs Basil E Frankweiller
Harry Potter Series (great read out loud books, if you're into that genre, even better when listened to on audio - Jim Dale, the actor who reads is incredible!!)