David Levithan's every day is a very unique novel that would appeal to Teens and Adults. A (that is his only name) wakes up in a different body every day, and has done so his whole life. It is heart breaking to think that as a small child he never had the security of a family or home, and some days he would wake up to absolutely terrible situations. I wish the book had explored this aspect a bit more. But essentially it is a love story. A wakes up one day in the body of a very unpleasant guy, but A falls in love with his girlfriend. The machinations A goes through to try to keep in touch with this girl are really quite amazing to read about. This was a very good book, if a bit shallow.
The Fault in Our Stars by John Green
The Diviners by Libba Bray
It's Kind Of a Funny Story by Ned Vizzini