Bill Stiltson arrives back at his bar after his last adventure, ready to make beer and live a normal life on the moon in the year 2538. Alas, he returns to find his lawn furniture on fire, the work of Jethro Duff, leader of the Moon Nationalist movement called the Lunatics. Bill soon learns that Jethro was following an online conspiracy theory accusing Bill of ruining the moon's economy, destroying lunar culture, and even eating people. Bill sends his intern Jimmy to investigate this conspiracy theory and bring back evidence for a lawsuit, but when Jimmy becomes apprentice to the ringleader conman Cody Duncan, he loses his grip on reality and begins to believe his own con. Now, Bill has to reel him back in.