Some good lessons here on suicide, and how kids can recognize the signs in their peers, and how they can hurt other people (both in terms of how they treat others, and how taking their own lives can affect the people who knew them)... good lessons that don't feel so much like lessons as like a real narrative. And the cassette tape "format" is brilliant BTW. 
 Talk about a book hangover! Read this one and then Gone Girl back-to-back in 4 days = emotionally exhausted.