Earth is an environmental disaster area when humanity gains new hope: a star gate is discovered in the solar system, built by a long-gone alien race. Earth establishes extrasolar colonies and discovers alien races—including the warlike Fallers, the only spacefaring race besides humans. Mysterious, uncommunicative, and relentlessly bent on humanity's extinction, the Fallers have mastered the star gates, and are closing in on earth. Dr. Bazargan commands the scientific team sent to a newly discovered world to study its humanoid natives: beings who literally perceive only one reality. To lie is to be unreal—and condemned to death. The humans must flee for their lives across the unknown planet when they and the aliens learn the scientific mission is a lie. It's the cover for a secret military exploration of the moon Tas, which is another artifact of the gate-makers: a superweapon capable of annihilating all life in a star system, and already known to the Fallers. Nancy Kress has won the Hugo, the Sturgeon, and three Nebula Awards. She is justly acclaimed as a literary SF writer, but receives little acknowledgement that her work is hard SF. Probability Moon should change this, winning her many new readers while pleasing her fans. It's a rare and desirable hybrid: a literary, military, hard-SF novel. Set in the same world as her Nebula- and Sturgeon-winning novelette, "Flowers of Aulit Prison," Probability Moon is the first book of a trilogy, but it has a self-contained story line. The sequel, Probability Sun, will appear in 2001, and the concluding book will be The Fabric of Space. —Cynthia Ward

Salvation or Annihilation? A strange artifact has been discovered on a distant planet, an artifact that may be the key to humanity's salvation. For we at war with the Fallers, an alien race bent on nothing short of genocide, and this is a war we are losing. The artifact is not only a powerful weapon, but possibly the rosetta stone to a lost superscience . . . a superscience that the Fallers may have already decoded. Or it may be a doomsday machine that could destroy the very fabric of space.

Nancy Kress cemented her reputation in SF with the publication of her multiple-award–winning novella, “Beggars in Spain,” which became the basis for her extremely successful Beggars Trilogy (comprising Beggars in Spain, Beggars and Choosers, and Beggars Ride ). And now she brings us Probability Space, the conclusion of the trilogy that began with Probability Moon and then Probability Sun, which is centered on the same world as Kress’s Nebula Award-winning novelette, “Flowers of Aulit Prison.” The Probability Trilogy has already been widely recognized as the next great work by this important SF writer. In Probability Space, humanity’s war with the alien Fallers continues, and it is a war we are losing. Our implacable foes ignore all attempts at communication, and they take no prisoners. Our only hope lies with an unlikely Major Lyle Kaufman, retired warrior; Marbet Grant, the Sensitive who’s involved with Kaufman; Amanda, a very confused fourteen-year-old girl; and Magdalena, one of the biggest power brokers in all of human space. As the action moves from Earth to Mars to the farthest reaches of known space, with civil unrest back home and alien war in deep space, four humans—armed with little more than an unproven theory—try to enter the Fallers’ home star system. It’s a desperate gamble, and the fate of the entire universe may hang in the balance.