I thought Offworld by Robin Parrish was very well written. The premise drew me into the story with the idea that everyone on Earth has disappeared while this team of astronauts has been away on Mars. However, the premise on the book cover isn't accurate...not everyone has disappeared at all, even though it appears they have during the first half of the novel. There's a good deal of action in Offworld and as I said, it is well written. However I found myself disappointed at the end by the reason for everyone's disappearance. I don't want to give spoilers, but with all of the suspense during the first half of the story, I was just expecting something a bit more monumental...something better explained than the Quantum machine thing.
A page turner until I began to see my expectations let down toward the end.