While technically a standalone volume in the Polity series, without having read the Agent Cormac series, a reader would be pretty lost. This takes place (primarily) about 20 years after the "Line War" at Masada, a theocratic world just outside of Polity space. Well, the theocracy lost and now Masada has a free human population along with the dracomen created by Dragon. Polity has kept Masada in quarantine, however, as lots of Jain tech are still floating around after the war.
The story centers on a giant albino hooder, one of the many nasty fauna found on Masada, who for many years left sculptures made of bone and sinew out of the things it ate; the theocracy deemed it the Technician, but could not do much about it. The story oscillates among a fairly broad cast. First, we have Chanter, a human adapt who has been on Masada since before revolution studying the odd sculptures left by the Technician. We also have Grant, a former rebel commander, who, after mucking around for a few decades on Masada, gets the task to guard Tombs, a former proctor of the theocracy. During the war, Tombs was attacked by the Technician, who ate his face and much of his body, but left him alive. For the last two decades, Tombs has been recovering in the last prison camp on Masada. The Polity knows the Technician left something in his brain, but have not performed any invasive operations; they just want him to be sane. Another main character, Amistad, an old war drone, now serves as something akin to Masada's protector, along with Penny Royal, a notorious, but allegedly reformed 'black' AI.
So, why did Asher return to Masada here? Well, without giving too much away, we pretty much know Masada was the home planet of a former space going civilization that vanished some two million years ago; the Gabbleducks who live on Masada are theorized to be some primitive relic of this race. If anything, The Technician unravels the mystery surrounding this vanquished race and the history of Masada. Pretty slow going for Asher, however, as he takes his time setting the stage for the denouement. While not as explosive as many of the Polity novels, I did enjoy this. The world-building is first rate and when the action pops up in fits and starts, no one does it better. 4 technical stars!!