Definitely hard science fiction. I thought it was written well, and very believably. I would definitely rec. this book to Mars fans or hard Sci Fi fans - and anyone interested in both ought to definitely read it. Definitely worth the time.
A story about 4 men and 2 women on a mission to explore Mars which, after landing, begins to go down the tubes. The chapters are short 1 1/2 to 3 pages with large type. It is more hard SF, something that is true to life type of story.