It all started the day Amy Anne Ollinger tried to check out her favorite book in the whole world, From the Mixed-Up Files of Mrs. Basil E. Frankweiler, from the school library. That's when Mrs. Jones, the librarian, told her the bad news: her favorite book was banned! All because a classmate's mom thought the book wasn't appropriate for kids to read. Amy Anne decides to fight back by starting a secret banned books library out of her locker. Soon, she finds herself on the front line of an unexpected battle over book banning, censorship, and who has the right to decide what she and her fellow students can read.