If you could choose one book as a mandatory read for all high school students, which book would you choose?

My immediate response would be Life of Pi, however, I'm not sure that one book would be useful or appropriate for every student. I'd like to be the kind of teacher who knows where each child is at and can recommend books uniquely suited to them at that time. It's sad when someone reads a book that they are not ready for yet, or it just is not relevant to them at that point in their life, and then so much of it is missed. In fact, a lot of the books that I've read and didn't get anything out of are probably brilliant books, and I just wasn't in the right place to absorb anything meaningful from them... Wow, that went down a rabbit hole!

Did I say Life of Pi? Life of Pi.