Andy Weir is back and once again he's putting the science in science fiction. Project Hail Mary is Weir's third novel, after the literary and cinematic sensation The Martian and his second book, Artemis. I enjoyed The Martian about as much as anybody. Weir has a knack for writing hard science in a way that's intriguing. I found Artemis to be a bit of a letdown. The science was there but the story wasn't. That's not a problem in Project Hail Mary. It's not only a return to form, but I found it to be his best work to date by a comfortable margin.