The Absolutely True Diary of a Part-Time Indian by Sherman Alexie
Arnold Spirit, aka Junior, is a smart, nerdy 14 year old who must straddle two worlds when he transfers to a rich, white high school in a suburb near the poverty-crippled reservation he grew up on. At once hilarious and heartbreaking, Junior finds friends and even love in his new surroundings, even as his family seems to be falling apart.