This is a book about suicide. The main character, if you can call her that, leaves behind cassette tapes explaining why she committed suicide, so as the reader, you go through the experience of one of her listeners, hearing her whole story.
I had mixed feelings about the book. It did make me think about how important it is to be kind and to be aware of what others around you might be going through. At the same time, the burden of guilt was placed on kids who were mean to her or adults who didn't "do enough" to help her, even though they didn't know what was going on. The consequences, especially for her family, weren't really dealt with either. I'm not a huge fan.