Well, that was just a MASSIVE disappointment. Not exactly bad…but man, just a missed opportunity and a total letdown as a conclusion to the otherwise-5-star Semiosis series. In fact, the book barely belongs in that same universe — or more correctly, belongs to half a dozen other recognizable and overused universes.
Rather than being set on the far-off (and brilliantly imagined) planet Pax as were the first two books, we are back on an all-too-familiar dystopian Earth some 850 years in the future — but which might as well be only 100 years away, for all the "imagining what tomorrow will look like" thought put into it. Dinosaurs have been brought back (Jurassic Park); mankind has expanded uncooperatively to the moon, Mars, and various space stations (The Expanse); an alien virus invades Earth (The Andromeda Strain); rogue robots are attacking humans (Robopocalypse)…and okay, sentient "rainbow bamboo" has been brought back from Pax, the one through-line with Semiosis and Interference. But even that proves a weakness here; as our bamboo protagonist Levanter (like, well, all plants) is literally rooted in place; so that despite all the disparate plotlines there is little real action in this story, with events either being viewed from a distance via the bamboo's system of interconnected roots and chips, or simply noted, ("there are reports of rioting in the city!;" "it looks like there’s fighting in Spain!").
What it DOES have in place of action, are boring political negotiations (the books 15-page "big finale" is as big a letdown as the last episode of "Game of Thrones) and a good amount of probably legitimate but certainly unexciting science, ("A specific enzyme, an endochitinase, might be effective because it cleaves chitin into harmless chemicals, killing the fungus cell. We should be making it automatically, stimulated by jasmonic acid…" um, okay).
Also (and more damning from a, y'know, plot point of view): the whole book's central premise is that Stevland, the also-brilliantly-realized and almost godlike bamboo character in the previous books (both of which were a full 100 pages longer than this one), sent his long-lived, "compassionate" bamboo offspring to Earth to "protect and dominate" the "quarrelsome and destructive" humans. But that is totally undermined here by the infighting, violence and pettiness of the bamboo itself — both in the relationship between the indecisive Levanter and her two "sisters" (which closely — if, I'm assuming, unintentionally — mirrors that of Cinderella and her evil stepsisters), as well as between the various interconnected (chips and roots, remember?) bamboo groves now spread across the globe, some of which are literally espousing "kill all humans!"
Oh, and I forgot to mention the hairless, blubbery humans who only care about the whales…
Anyway — kudos at least to our local library system, who purchased this at my request through their "Suggest A Title" feature, (they had the two earlier books but not this one). So 2.5 stars rounded up for that alone — SUPPORT (and pester) YOUR LOCAL LIBRARY!