Can you think of any novels on the theme of philanthropy or charity?

A book that's kind of deep about giving to other people is Stargirl. It's about a girl who does everything for everyone else and they all make fun of her for it. The main character is a guy who falls in love with her. It's not all that lengthy either, so it should be easy to use for a report. And it's not for little kids really, it could be teens or adults.