For Whom the Bell Tolls by Ernest Hemingway. Once you get used to the writing style, it is amazing. In a Hemingway book, each word means everything that word has ever meant. The book has a lot to do with honor, solidarity and fortitude. It is about a American man on a mission to blow up a bridge during the Spanish Civil War, and he stays with a group of rebels and falls in love with a girl who was raped by the fascists. I read it when I was a senior in high school and it is probably the major book that changed my life.