The entire bioshock collection is free on epic games. I don't know much about it but I know I have a few people who are super into it so now is the perfect time to talk people into trying it out

Bioshock is a fantastic series. Fundamental in the progression of the FPS as a genre, and excellent in its own right. The writing is superb, the storylines interesting. The only real downside in their plotline is the Second Coming/Puppy-Kicker dichotomy of their "moral choices".