Another excellent Hugo nominee candidate for 2026, I'd have given this three stars right after finishing it — enjoyed it, moved on to read other books. I kept turning this one over in my mind and just about every thread I pulled on turned out to be load-bearing. That's a four-star book. Bring on whatever Tesh does next.
"The Incandescent" sprinkles in some excellent humor throughout. I also listened to this partly as audio book and quite enjoyed the narration.
Dr. Sapphire Walden runs Chetwood School's magic department the way you'd expect from someone who's spent two decades turning herself into an institution: forms, wards, risk assessments, six hundred teenagers with the theoretical capacity to accidentally summon something "approximately as destructive as a nuclear bomb." She's also got a tenth-order demon called the Phoenix bound into the tattoos on her arm, a decade-old leash she keeps because it's the only way she survived losing her boyfriend to a different demon at seventeen,at this same school. She says outright that she's the most powerful magician to ever walk through Chetwood's gates, and that's not incidental swagger. It's why she came back at all. This is the place that took Charlie from her as a student, and she's returned as the one person capable of standing between it and the student body, which makes the whole book as much a reckoning as it is a workplace story. On the surface this is dark academia with a competent forty-year-old at the wheel instead of a student, which is reason enough to read it. Underneath, it's doing something sneakier: the entire demon-containment premise is a metaphor for what Walden does to herself.
Start with the names: she's referred to as"Walden" like you would refer to someone in a news story, the military or sports team, or maybe this is normal for boys in UK public schools. It's a convention that gives her more authority than she feels her given first name would -- and creates distance dressed up as professionalism. "Dr. Walden" is a step further in, not out — the title she's earned and insists on from almost everyone, the credentialed self she holds up as a shield precisely because it can't be argued with. "Saffy" is the one people only get it after they've done something to earn actual vulnerability from her, not competence or tenure, and there aren't many of them. She sees her given name "Sapphire" as too "pretty" and feminine; she feels exposed by it and doesn't feel comfortable to use it. Her family likely would be able to safely invoke that name whether she liked it or not. Four names, four escalating layers of control over how close anyone's allowed to get, and the book only lets you hear the real one in the handful of moments she stops managing herself long enough to be touched. In a book literally about invocation and binding — where naming a thing is how you control it — that's not incidental. She's doing to her own name exactly what she does to demons: containment through diminishment.
The Phoenix itself is the same impulse taken to its limit. She didn't just survive a demon encounter and get stuck with the thing, she summoned a tenth-order demon during her PhD research specifically to prove she could bind and control something that size, and then kept it leashed in her own skin for over a decade as a kind of walking dissertation defense. It's not a trauma she's managing, it's an achievement she engineered: the ultimate credential, proof that even the most dangerous thing imaginable can be made to sit obediently under her authority. Which makes it the purest version of the "Dr. Walden" persona there is, not armor she happened to acquire, but armor she built from scratch and can point to as evidence she never needs anyone.
Laura Kenning, the school's Chief Marshal, is the person who gets to see past the armor, and their slow burn is genuinely good: two extremely competent people sparking off each other in the middle of actual crises. She's also the one Walden is most helplessly attracted to, which is exactly the problem. Mark, by contrast, she essentially falls into bed with, and the book is careful to show that it's never more than that — a body she can keep at "Walden" distance the entire time, no real self on offer from either side. That's precisely why he's safe. He was never going to ask for Saffy. Laura is the one who might, and the book doesn't let this be easy: the second Laura gets pulled away and real intimacy becomes possible, Walden reflexively fills the vacancy with the person who requires nothing of her. It's the same reflex as the name, just played out physically instead: whatever's dangerous, whatever might actually get in, contain it or swap it for something smaller. Her past relationships get the same treatment in the way they're described; even in memory she keeps them at surname distance, competent and clipped, nothing that reads like she ever let anyone see more than "Dr. Walden" required.
The book also just proves the point through action, which I appreciated more than any amount of subtext could have managed on its own. Every time Walden is actually in danger, it's Laura who shows up and has her back, no hesitation, competence meeting competence. Laura even takes the fall after the first incident which is what takes her briefly out of Walden's orbit at Chetwood. When Walden takes newly hired consultant (and uncle of a smarmy student) Mark out on a security check -- he disappears the second anything sketchy happens. He's not backing her up, leaving her to handle it alone. So no, I did not feel bad when he ends up locked in stasis in the void. The man is a tool who vanishes the moment something requires him to actually be present for someone, and the book quietly lets his behavior in a crisis do what pages of interiority couldn't: show you exactly why he was never a real option, whatever Walden or the Phoenix told themselves about it.
The book is also very funny about all this, which keeps it from tipping into self-seriousness. The Phoenix, once actually let out to have opinions, puts Walden on a fitness regimen — not as discipline, but because its whole argument is "you have this body, use it, why are you just letting it sit there and run risk assessments." It's more pointed than a demon just liking bodies: the thing she summoned specifically to prove her own control is the one voice that keeps arguing against control as the goal, in favor of a woman who's spent twenty years treating her own body as infrastructure actually living in it instead.
Later there's a gut-punch of a reveal that she's had Mark locked in stasis for months, which retroactively explains her blind spot: she wasn't fooled, she just handled the threat the only way she knows how, which is binding rather than confronting. What I found genuinely unsettling, though, is that the book never fully separates out whose call any of this was. She catches Mark stepping out with another colleague, and that seems to be the thing that tips the Phoenix but by that point Walden and the Phoenix are so fused that you can't tell where her own fury ends and the demon's takes over. Was the fitness regimen her, using the Phoenix as an excuse to finally treat her body like it's hers? Was locking Mark away her decision, or the Phoenix's, once it decided she couldn't be trusted to protect herself? The book doesn't answer that, and I don't think it's supposed to. It's the dissertation's whole premise coming back around: she proved she could control the Phoenix, and a decade later it's an open question whether the control was ever real, or whether it was hers to begin with. Not every demon in this book gets that kind of ambiguity, either — Old Faithful, who wears her dead boyfriend's face to torment her, is just monstrous, no interiority offered, and correctly gets fought rather than befriended. The book is careful about that distinction; it's not arguing everything scary is secretly fine if you just let it out, it's arguing you have to learn to tell the difference, even when the line runs straight through the middle of your own body.
There's a nice parallel running alongside all this in Nikki Conway, Walden's star student, whose own hesitation about leaving for university is running the same test at a different life stage — not "can I be loved" but "can I trust myself with more room than what already feels survivable." The book is smart enough not to make this a mentor-transmits-wisdom arc. Nikki doesn't learn from Walden's example; they're each stuck figuring out, independently, that the caution that once kept them alive has calcified into a ceiling. At the end of the story, they are both pecking those little cracks in their protective shells and preparing to spread their wings into something new and different - and I am cheering them on!
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