Tor, Sep 2002, 24.95, 367 pp.
The war between mankind and the Fallers goes unabated as humanity's enemy still ignores any transmissions from their opponents. If anything, the hostilities are turning worse at least for humans as it looks inevitable that the Fallers are going to win. An alien victory means the end of humanity because no one survives a battle let alone a war with the enigmatic Fallers.
The taste of defeat leads to an earthly coup with the new leader apparently willing to use a “not of this earth” doomsday machine (that the Fallers also possess) to annihilate the enemy. However, not everyone agrees with the wisdom of deploying a device not fully understood as to its ramifications and most likely will also rip the space-time continuum. Physicist Capelo, Major Kaufman, and sensitive Grant try a Hail Mary ploy to communicate with the Fallers before the galaxy as it is relatively known is ripped asunder forever.
The final novel in the “Probability” trilogy (see Probability Sun and Probability Moon) is an exciting climax to a strong series. The story line of Probability Space can stand alone yet brings closure that will please fans of the series and coax newcomers to seek out the previous books. Though the probability of some of the events occurring as written seems statistically unreliable, Nancy Kress furbishes a strong climax to a delightfully intelligent triad.
This report prepared by Harriet Klausner