Children of Ruin recap

In an earlier age, a human terraforming expedition reaches a distant system with two candidate worlds. The scientist Disra Senkovi sets about uplifting octopuses to help reshape a water world, while the mission's leader, Yusuf Baltiel, discovers that the second planet already harbors native life, a strange and dangerous alien organism. When catastrophe cuts the mission off from home, the uplifted octopuses inherit their world and grow into a volatile spacefaring civilization, and the alien life takes its own grip on events. Long afterward, a joint crew of humans and uplifted spiders from the united civilization of the previous book, carrying the preserved intelligence of Avrana Kern, travels to investigate old signals from the system. They make first contact with the chaotic octopus society and confront the terrifying alien organism, which can infect and inhabit other beings. Struggling across vast gulfs between wholly different kinds of minds, and at great cost, the explorers move from terror and misunderstanding toward communication, and the story closes with a fragile new coexistence among humans, spiders, octopuses, and the alien intelligence.

In the first book, a far-future scientist named Avrana Kern tried to uplift monkeys on a terraformed world, but sabotage wrecked the mission and her nanovirus instead accelerated the evolution of the planet's spiders over thousands of years, while Kern lingered as a watching intelligence in orbit. In parallel, the ark ship Gilgamesh carried the last remnants of humanity, fled from a ruined Earth, on a long search for a home, with the historian Holsten Mason repeatedly woken across the centuries. When the desperate humans finally reached the spiders' world, the two peoples came to the brink of war, but rather than destroy the humans the advanced spiders released a modified virus that let both species see each other as kin. Humans and uplifted spiders merged into a single shared civilization, with Kern's consciousness preserved among them, a united people now able to reach out to the wider galaxy.

This second book opens the way the first did, on two widely separated timescales. In the deep past, a human terraforming expedition arrives at a distant system with two worlds to consider, and its scientists begin their work, including bold, unconventional experiments that will echo down the ages. Much later, a joint crew of humans and uplifted spiders from the now-united civilization, carrying the preserved intelligence of Avrana Kern, sets out to investigate signals coming from that same distant system, not knowing what they will find. The premise is set for another story of first contact and of minds trying to understand one another across enormous gulfs of biology, time, and experience.

The book's two timelines resolve into a single, hard-won theme: understanding reached across minds that could hardly be more different. The old expedition's legacy, Senkovi's uplifted octopuses on their water world and the alien organism native to the neighboring planet, becomes the puzzle the later explorers must face. The joint human-and-spider crew, aided by Avrana Kern's intelligence and by specialists in communication, make a fraught first contact with the emotional, unpredictable octopus civilization and come up against the alien life of the second world, a distributed organism able to infect and inhabit hosts, which spreads terror among them. Rather than the story ending in mutual destruction, the explorers manage, at real cost, to find ways to communicate with the octopuses and even with the alien mind, translating between radically foreign kinds of thought. The result is a tense but genuine accommodation: the united civilization of humans and spiders is enlarged to include the octopuses and a form of the alien intelligence, extending the series' central idea that even the strangest of minds can, with effort, be reached and lived alongside rather than simply feared or destroyed.