*Third. Second was Artemis, a book set in an established but somewhat struggling moon colony, where the main character, a small-scale smuggler, gets in over her head when she lets her greed overcome her better sense and signs up for a sabotage mission.
I started reading The Martian myself back when Weir was a webcomic author, and started posting chapters on his forums, but I decided to wait until he had put the whole thing together so I could read it in one go. Which I find somewhat ironic, since now I'm reading Pale Lights (the new novel by the author of A Practical Guide to Evil) one chapter a week.
Grey Wolf