Rich, incredible world building and a twisty, turny plot that kept me riveted.
A young woman from a planet rebelling against Earth finds an abandoned AI mech that could end the war, if she can bring herself to follow her training and sacrifice his life. Beautifully written.
A technically dense science fiction book about one man trapped alone on Mars and his plan to get home. By turns funny, sarcastic, and optimistic despite all odds, you just have to root for him.
Originally written as a set of interconnected short stories, the end of the first story blew my mind. Worth it for that alone, but the rest are great, too.