The Catcher in the Rye is the ALLTIME Classic teen book. OK, Holden Caulfield is rich and negative. His time in New York is journey into maturity. Read it. Don't shoot anybody with the book in your pocket or I will revoke your library card!
The Road (Cormac McCarthy). Understated and straightforward but written with beautiful language and some heartfelt moments. A dad and young son "carry the fire" to the coast in a post apocalyptic cannibalistic world.