For "fairness, equality, and justice", you can't go wrong with John Rawls' seminal Theory of Justice (which is not public domain, though Rawls probably would have made it so if he reasonably could have in his day). This book incidentally provides a powerful counterpoint to libertarianism, if you happen to lean in that direction.

There's also this free online course at Harvard. I haven't seen it myself, but I hear it's very good, and the teacher is a big name among us philosophers.