From the two-time Sidewise Award-winning author of the acclaimed trilogy comes an alternate 1979 where the US and the Soviets have permanent Moon bases, orbiting space stations, and crewed spy satellites supported by frequent rocket launches. Apollo 32, commanded by career astronaut Vivian Carter, docks at NASA's space station en route to its main mission: exploring the volcanic Marius Hills region of the Moon. Vivian is caught in the crossfire as four Soviet Soyuz craft appear without warning to assault the orbiting station. In an unplanned and desperate move, Vivian spacewalks through hard vacuum back to her Lunar Module and crew and escapes right before the station falls into Soviet hands. Their original mission scrubbed, Vivian and her crew are redirected to land at Hadley Base, a NASA scientific outpost with a crew of eighteen. But soon Hadley, too, will come under Soviet attack, forcing its unarmed astronauts to daring acts of ingenuity and improvisation. With multiple viewpoints, shifting from American to Soviet perspective, from occupied space station to American Moon base under siege, to a covert and blistering US Air Force military response, tells the gripping story of a war in space that very nearly might have been.