something I've wondered about: The Apollo 11 landing was not a 100% sure thing, a lot could have gone wrong. what if Armstrong and Aldrin had ended up stranded on the lunar surface? What would it have been like for Mike Collins to make that trip back to Earth alone for four days?
(Trivia: Nixon's speechwriters had a speech ready for this sort of eventuality.)
American Public Media did a radio drama based on the premise called "
Moon Graffiti." The last moments of Armstrong and Aldrin are dramatized, and Nixon's speech is read. It doesn't look at Collins' return alone, though.
James Michener does that with a fiction mission in
Space, where the Apollo 18 Command Module returns to Earth alone after the Lunar Module crashes back to the moon's surface.