There is one called "The Scout Mindset" by Julia Galef. It's an amazing resource when it comes to teaching critical thinking, because it gradually introduces the reader to the virtue of being able to change your mind/opinion based on new information. I think that's a fundamental skill everyone needs in order to use critical thinking in a meaningful way.
The Selfish Gene by Richard Dawkins. Everything you need to know about human behavior, motivations, history can be extrapolated from it.
Les Miserables by Victor Hugo. Almost as long as a holy book...longer than many actually! This is the book with the most human wisdom wound in its pages I've ever read (though HHGTTG goes toe to toe with it and is a hell of a lot funnier!)
Non hateful, badic philosophy introduction. Maybe how to be perfect by michael schur or some introduction to self development philosophies like Stoicism. That would immediately fix majority of the world's problems.