In the sequel to Hot Moon, set in an alternate 1983, Apollo astronaut Vivian Carter and her crew barely survive an armed attack from mysterious assailants at the lunar South Pole. Back at the joint Zvezda-US Copernicus Moonbase, the precarious Cold War cease-fire between the NASA and Soviet crews comes under threat from another consolidated assault. Vivian must navigate a treacherous political and military landscape, and travel from the lunar surface to high lunar orbit and back again, to solve the riddle of these strange lunar incursions and move ahead to a future that even she can barely imagine.