The Relentless Moon, the third book in Mary Robinette Kowal’s Lady Astronauts series, changes locales and first-person narrator from the first two books, The Calculating Stars and The Fated Sky. Nicole Wargin is also one of the original astronauts, and in early 1963 as The Relentless Moon opens, she is both an old Moon hand and the wife of the governor of Kansas, the new center of America’s space industry.
Though the lunar settlement is firmly established with flights to and from nearly routine, and the first Mars expedition nearly halfway to its destination, opposition to devoting so much of humanity’s resources to spaceflight — and eventual evacuation of as many people as possible as Earth becomes increasingly uninhabitable — is growing. The book’s first scene is a political reception in Kansas City, the new capital of America, interrupted by gunfire through the windows of the room where the reception is taking place. The militantly anti-space group Earth First soon claims responsibility. Unsettlingly, evidence mounts that Earth First has sympathizers in both the American government and the International Aerospace Coalition (IAC), the global body governing spaceflight.
The overarching structure of the book is a search for the person or persons who could be behind most of the mechanical problems plaguing IAC launches and the American spaceport in Kansas. Kowal does not set up The Relentless Moon as a tightly-crafted whodunit; instead, she tells it as people going through their daily lives, working, striving, hanging on. It’s just that their daily work is in space or on the moon, an environment dangerous enough without someone trying to make it deadlier still while remaining undetected so as to keep doing damage.
In her afterword, Kowal says “When I wrote this book, COVID-19 didn’t exist.” (p. 541) It’s a little uncanny, then, that one of the major complications of The Relentless Moon is that polio gets transmitted to the Moon. In the Lady Astronauts timeline, Jonas Salk and his whole institute were wiped out by the Meteor. A polio vaccine is just coming into use, and people are resisting its use. Polio is contagious and deadly. The measures that the characters have to take on the Moon are familiar: isolation, quarantine, treatment with limited resources and an incomplete understanding of the disease.









