Mike was supposed to be the first man on Mars. He wasn't prepared to be asked for his passport when he arrived, nor to be appointed the new CEO of Mars Inc. Nothing is what it seems and this story has a Matrix or Alice in Wonderland feel to it, it's so unexpectedly odd.
It does have some very cool reflections of Total Recall, but it's also very much its own story.
Oh, and watch out for the chocolate muffin. A definite jaw-drop moment there - and not just because of the size of the muffin.
Written in Mr Greathead's usual quirky style, I highly recommend Mars Inc.
If this doesn't whet your appetite for the rest of Greathead's work, I don't know what will.