A modern classic. I read House of Stairs
frequently as a child, and was happy to see this speculative novel from 1974 stands the test of time.
That's because Sleator wisely keeps the "futuristic" science fiction touches to a minimum. There's a very '70s reference to air pollution, but it isn't pivotal. The rest of the book is about what doesn't change: human nature.
I'm handing this to my son to read now. I have the feeling he'll be as riveted by it as I was at his age.