Okay so the made up vocabulary is a real hurdle, I want to say that up front because I almost quit around page sixty when I realized “concent” wasn’t a typo for “consent” and I was going to have to hold about forty new nouns in my head with no glossary in sight (there is one, in the back, I did not find it until embarrassingly late). Once the words settle, though, this is one of the most purely pleasurable big dumb premises I’ve read in years: a world where mathematicians and philosophers live in walled monasteries, cut off from secular society except for ritual gates that open once a year, once a decade, once a century, and the whole plot turns on why the smartest teacher in the place just got expelled.

The theological cosplay of it all is doing real work, not just set dressing. Stephenson is using the “saunts” and their “Discipline” to run an actual argument about whether math exists independent of anyone thinking it, and the alternate world lets him stage that argument at a remove instead of having a physics professor deliver a lecture at you directly. I liked that trick a lot. What I didn’t love: the back third turns into exactly the kind of “here’s eight famous philosophical positions with the serial numbers filed off” tour that a couple other readers have called out, and once you clock that Halikaarnian and Procian are just standing in for real schools of thought, some of the mystery drains out of it.

Still finished it in under two weeks, which for nine hundred pages of vocabulary homework is saying something. Reamde this is not. It’s slower, weirder, more interested in its own furniture. I’d hand it to someone who liked The Glass Bead Game and wanted twice the plot.