Speak by Laurie Halse Anderson

The groundbreaking National Book Award Finalist and Michael L. Printz Honor Book with more than 3.5 million copies sold, Speak is a bestselling modern classic about consent, healing, and finding your voice.

Challenged for "sexual content" — it is a novel about a teenager surviving sexual assault. That's not a bug, it's the point. One of the most important books a young person can read.