“That is horrifying and I want to go home,” I said, although I pronounced it, “Ah. I see.”

What Stalks the Deep by T. Kingfisher
SERIES: Sworn Solider #3
LENGTH: 179 pages
GENRES: Horror, LGBT+, Fiction
PUBLISHER: Tor Nightfire
RELEASE DATE: 30 September 2025
BOOK DESCRIPTION:
The next novella in the New York Times bestselling Sworn Soldier series, featuring Alex Easton investigating the dark, mysterious depths of a coal mine in America
Alex Easton does not want to visit America.
They particularly do not want to visit an abandoned coal mine in West Virginia with a reputation for being haunted.
But when their old friend Dr. Denton summons them to help find his lost cousin—who went missing in that very mine—well, sometimes a sworn soldier has to do what a sworn soldier has to do…
My Review

“Another fungus?” I asked sharply. Denton drank down his whiskey and signaled for another one. Ingold watched me, his arms folded, and I wondered how much Denton had told him about what we saw in the tarn.
“Not a fungus,” Denton said, when the waiter had left again. “At least, I don’t think so. But more lights in the deep.”
I was very pleased with What Stalks the Deep. It was definitely a step up from What Feasts at Night and, to me at least, nearly on par as the first novella in the Sworn Solider series, What Moves the Dead.
Alex Easton and Angus are back in a brand new adventure, and they’re both just as wonderful as before. Especially Angus, he’s the best – the highlight of every scene that he’s in. Easton is great too, of course, and I love their narration, but Angus is just… Angus.
“We’ll get to the wasps in a moment,” said Denton. “May I introduce my friend, Mr. John Ingold? John, this is Lieutenant Alex Easton and Angus… ah… forgive me, it occurs to me that I don’t actually know your full name.”
“No one does,” said Angus gruffly.
This book also features the return of Dr. Denton, who was a major supporting character in the first novella. It was nice to see him again. Denton contacts the two for help locating his cousin, actually, which is what sets off the plot of the book. We’re also introduced to a new character, Ingold, who through his connection with Denton, is far more interesting than the characters introduced in book two.
The story here also pulled me in more than the one in the second novel, and the atmosphere was back on point. It’s a little different when compared to What Moves the Dead, but the vibes were similar enough to draw me in the same way. The setting was also a little bit more interesting to me. Nothing like a small town and a creepy old mine to set the tone.
Unlike What Feasts at Night, I actually enjoyed the monster here, as well as the twist involved with it. Similar to the story and atmosphere, the creature feature here was more akin to the one in the first book, which I felt was far better than in the second one. Less supernatural this time around, which I appreciated. The buildup also reaches a satisfying conclusion for me, and I enjoyed how things wrapped up.
“Rules of life,” Angus said. “Be true to your friends, don’t cheat at cards, don’t piss on the less fortunate, and don’t steal other people’s skeletons.”
“You just added that last bit now,” I said.
“Obviously should’ve been there all along.”
What Stalks the Deep was a solid addition to the Sworn Solider series, with a return to form with its monster, unsettling setting and tone, and fast pace. If there’s ever another addition to the series, I’ll definitely read it. I think fans of this series will like the continuation, as well as fans of Kingfisher’s other horror stories.
As always, thank you so much for reading, and I hope you have an amazing day/night!
See ya ~Mar
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