Two books you might like are "Confessions of a Murder Suspect" by James Patterson and "Princess in Training" by Meg Cabot. they are both really good! I got hooked and didn't want put then down. the Meg Cabot book may be a little bit more of high school and upper middle school level, but it is still really good.
Some of the best books to read for middle school level include Matched Trilogy, The Giver by Lois Lowry, The Hunger Games and The Lightning Thief by Rick Riordan. It is always best that you look for books which are educative or the ones that will sharpen your skills.