Echo of worlds

In the conclusion to the Pandominion duology (following Infinity Gate, 2023), two multiversal empires hurtle toward mutual annihilation. Since neither the organic Pandominion nor the machine hegemony recognizes the other as sentient beings, negotiation is impossible: There can be only complete destruction of the other side to remove the inconvenience. The potential for reconciliation is slim indeed, lying in a small and desperate band consisting of Topaz, a young woman evolved from a rabbit; her best friend, Dulcie, a former member of the machine hegemony; Essien and Moon, two mentally unstable, renegade Pandominion soldiers; a digital copy of Hadiz Tambuwal, a dead physicist; and Rupshe, a liberated AI. Rupshe believes that they must appeal to the Mother Mass, a planet-size intelligence who may have the power to halt this looming apocalypse. Of course, the location of the Mother Mass is one of the Pandominion's closely held secrets, and trying to uncover it will attract unwanted attention to our fugitive heroes. Cue plenty of desperate situations from which the protagonists make hairbreadth escapes; but even though literally billions of background characters die, there never seems to be much doubt that they will ultimately triumph (especially since the story is narrated from a time period after these events). But in the midst of that breakneck action, Carey wants to give the reader a lot to think about, beginning with the central Aesop: Xenophobia is bad, and we must respect sentient beings regardless of how alien they look, think, or behave. Related to that, we have the classic SF warning that it's unwise to hand over your infrastructure to a complex machine, because it's eventually going to become self-aware and start having opinions. There's also something in there about the dangers of an oversize, autocratic bureaucracy filled with workers focused more on personal advancement than helping people. But if the author is offering a message about manifest destiny and environmental conservation, it's decidedly mixed: While Carey vividly depicts polluted, devastated landscapes, the story strongly suggests that since there seems to be an infinite amount of resources, there's always another unspoiled world to escape to whenever things get too bad. A wild if somewhat predictable ride; slightly unwieldy but reasonably entertaining. Copyright (c) Kirkus Reviews, used with permission.