The Perks of Being a Wallflower by Stephen Chbosky is an unusual book that tells the story of one boy's experience during his Freshman year of High School through a series of letters to an unknown friend.
Charlie has always been smart and keeps mostly to himself. In his freshman year of High School, he unexpectedly becomes involved in a group of friends. They accept him for who he is while he participates in new and sometimes strange activities. He goes to parties, football games, and travels around town. He falls in love, gets in a relationship, and breaks a girl's heart. He even experiments with different kinds of drugs.
Despite the fact that the novel is written in first person as a series of letters, the writing lacks emotion outside of simple statements of anger, sadness, and happiness. This gives the events in the story a dissonant feeling, making it difficult for the reader to get an idea of what is going on in Charlier's head. I think this style actually benefits the story in the end, since he ultimately learns that just going along with things, rather than expressing oneself isn't necessarily beneficial.
There's a Boy in the Girl's Bathroom by Louis Sachar
Manic Magee by Jerry Spinelli
Flowers for Algernon by Daniel Keyes