What’s a book you think a high school library should have, which isn’t a (known) classic or very popular/part of the “books to read canon”

What are 1-5 books you think every school library should have, but aren't the "well known" or "given" books (like Dostojevskij/Tolstoj/Lee/Steinbeck/Collins/Tolkein/Austen/Chobsky etc etc.). Something a tad bit more obscure that you read and thought perhaps it would be a good addition to a school library/something a teen should read

Ages of the teens is 15-19, some with advanced reading skills and some with next to none. Books can be Middle Grade to adult.

Just want to see what other people think are good books