Probability Moon

Earth discovers abandoned star gates that lead humanity to a genocidal alien race, in this space opera trilogy opener by a Hugo and Nebula Award–winning author.

“The author of Maximum Light blends a taut story of survival and culture shock with a thoughtful exploration of the nature of humanity.” —Library Journal

Humankind has expanded out into interstellar space using star gates—technological remnants left behind by an ancient, long-vanished race. But the technology comes with a price. Among the stars, humanity encountered the Fallers, a strange alien race bent on nothing short of genocide. It’s all-out war, and humanity is losing.

In this fragile situation, a new planet is discovered, inhabited by a pre-industrial race who experience “shared reality”—they're literally compelled to share the same worldview. A team of human scientists is dispatched—but what they don’t know is that their mission of first contact is actually a covert military operation.

For one of the planet's moons is really a huge mysterious artifact of the same origin as the star gates . . . and it just may be the key to winning the war.

“Kress’s Sleepless trilogy proved that she was a serious writer, worthy of considered attention. Probability Moon only emphasizes that.” —Locus

“Twisty and compelling, brimful of ideas, with Kress’s usual life-sized characters: top-notch work from a major talent.” —Kirkus Reviews