<blockquote>Mark Watney never manages to make contact with Earth and NASA never realizes that he survived the storm and evacuation on Sol 6. So, needless to say, the crew of the Ares IV is incredibly surprised when they land on Mars to find a scruffy, malnourished, mentally unbalanced, but still-alive astronaut waiting for them.</blockquote>
➤ There are sequels but I don't find them nearly as compelling