telepathy | Bookshelf Fantasies

Title: Butterfly Effects
Series: Incryptid, #15
Author: Seanan McGuire
Publisher: Tor Books
Publication date: March 10, 2026
Length: 432 pages
Genre: Urban fantasy
Source: Review copy courtesy of the publisher via NetGalley
Rating:

Seanan McGuire’s New York Times-bestselling and Hugo Award-nominated InCryptid series continues with the fifteenth book following the Price family, cryptozoologists who study and protect the creatures living in secret all around us.

Chaos, noun:
1. The inherent unpredictability in the behavior of a complex natural system.

Chaos theory, noun:
1. A branch of mathematical and physical theory that deals with the nature and consequences of chaos and chaotic systems.
2. The study of unpredictable systems.
3. See also “impossible math.”

Sarah Zellaby is a Johrlac, a member of a species of psychic ambush predators colloquially referred to as “cuckoos.” Eight years ago, she survived the difficult, painful process of becoming a cuckoo queen…although not without costs. In the wake of her transformation, the man she loved was entirely erased from his own mind, forcing her to reconstruct him from the memories of the people who knew and loved him.

Sarah has been struggling to come to terms with her actions ever since. But there’s no one else on the planet with the power to hold her accountable―until the Johrlac authorities show up. It’s time for her to stand trial for what she’s done, something which can only happen on Johrlar, home world of her species, where the population is controlled by a system of unyielding hiveminds and crime is punishable by erasure.

With Sarah’s life on the line, her family will need to find a way to cross dimensional borders and survive a hostile, telepathic world in order to get her back―before the Sarah they know ceases to exist.

But no matter what happens, actions have consequences… and Sarah Zellaby is about to learn that lesson the hard way.

Fifteen books in, the Incryptid series remains wildly inventive, with a stunningly huge array of characters and nonhuman species to keep track of. The Price-Healy family remains at the center of it all, but the details and mythology at this point are so complex that it feels next to impossible to talk about this book specifically in any sort of way that makes sense.

But I’ll try.

Butterfly Effects is the 3rd book in the series to focus on Sarah Zellaby as the main character, which is tricky. Despite appearances, Sarah is not human — she’s what’s known as a “cuckoo”, a descendent of a group of Johrlacs exiled generations earlier from their home dimension Johrlar. Johrlacs are telepathic, and cuckoos are considered ambush predators here on Earth. Through the power of their minds, they can take over anyone else’s thoughts and rewrite them — so a cuckoo child, for example, can convince a new family that they’re loved, that they belong, and that they’ve always belonged. And that’s among the least harmful examples. When a cuckoo wants to influence someone, the person being influenced has no defenses and won’t even know it’s happening.

The Price family has been studying and interacting with cryptids — non-humans — for generations, and is uniquely suited to providing Sarah with a home. Sarah is the adopted daughter of one of the family matriarchs, and has been raised to use her abilities responsibly. What’s more, Sarah was raised with love — she’s part of the family. But eight years before the events in Butterfly Effects, she evolved into a cuckoo “queen”, and her powers essentially exploded beyond her control, causing damage that she never intended. Now, years later, Sarah has been forcibly extracted back to Johrlar, supposedly to be held accountable for her actions… but more sinister motivations are at play.

When Sarah is taken, her family springs into action — including her cousin Antimony, Antimony’s boyfriend Sam, and her grandparents Alice and Thomas who — for… reasons — appear to be no older than their grandchildren. This team of fighters and sorcerers heads off on a rescue mission, but once on Johrlar, finds themselves in grave danger as well.

Like I said, it’s complicated. Fortunately, this book has Sarah share the narration, so while she’s the main POV character, there are sections where Antimony takes the lead. Honestly, it’s a relief. Not to be all speciesist… but Antimony’s human mind is a much less headache-inducing place to be than Sarah’s. Sarah thinks in math and equations, and her telepathy and worldview can be insanely twisty and hard to relate to.

I do love this series as a whole, but it’s so wide-ranging that it can be hard to keep track of. With books focusing on so many different characters, I constantly need a refresher on where we left off, where the major players are, and whose lives are dealing with which crises. (Books #13 and #14 were told from the perspective of the family’s ghost babysitter… to give you an idea of just how strange a series this is!)

Maybe it’s just because they were introduced first, but the core Price family siblings and their immediate families remain my favorites, and when they’re off-page for too long (or for entire books, except for brief drop-bys) I miss them. Butterfly Effects seems to provide a definitive wrap-up to most of Sarah’s ongoing issues (at least, for now), so I’m hoping the next books in the series will move back to focusing elsewhere within the family.

Butterfly Effects took a while to draw me in. Eventually, I was hooked on the latest adventure and started feeling like I was reading a page-turner… but there were definitely moments where I felt like I was reading this one more out of obligation than enjoyment. Still, Seanan McGuire is a terrific storyteller, and overall, I’m sticking with the series, even though I didn’t connect with this particular book quite as much as with some of the earlier installments.

Once again, I’ll point out the obvious: This is not a book to start with! The Incryptid series is so complicated by now that it can only be appreciated by starting at the beginning — which I recommend! It’s a truly creative series with lots of entertainment value, interesting plot twists, and deeper emotional beats. And for those devoted to this world, there are countless spin-off/prequel stories available via the author’s Patreon and elsewhere, so you’ll never run out of Price-Healy family history to explore.

So, while book #15 wasn’t actually my favorite… I’ll certainly be back for #16, and can’t wait to find out whose story we’ll be getting next!

As with other books in the Incryptid series, this one includes a novella at the end, We Sing It Anyway. This story is really more of an epilogue to the main book, although with a different character in the lead role, who deals with the immediate aftermath of the events of Butterfly Effects. It’s a sweet conclusion, and provides both closure and healing to Sarah’s story’s impact on other family members.

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From #1 New York Times bestselling author Stephen King, the most riveting and unforgettable story of kids confronting evil since It—publishing just as the second part of It, the movie, lands in theaters.

In the middle of the night, in a house on a quiet street in suburban Minneapolis, intruders silently murder Luke Ellis’s parents and load him into a black SUV. The operation takes less than two minutes. Luke will wake up at The Institute, in a room that looks just like his own, except there’s no window. And outside his door are other doors, behind which are other kids with special talents—telekinesis and telepathy—who got to this place the same way Luke did: Kalisha, Nick, George, Iris, and ten-year-old Avery Dixon. They are all in Front Half. Others, Luke learns, graduated to Back Half, “like the roach motel,” Kalisha says. “You check in, but you don’t check out.”

In this most sinister of institutions, the director, Mrs. Sigsby, and her staff are ruthlessly dedicated to extracting from these children the force of their extranormal gifts. There are no scruples here. If you go along, you get tokens for the vending machines. If you don’t, punishment is brutal. As each new victim disappears to Back Half, Luke becomes more and more desperate to get out and get help. But no one has ever escaped from the Institute.

As psychically terrifying as Firestarter, and with the spectacular kid power of It, The Institute is Stephen King’s gut-wrenchingly dramatic story of good vs. evil in a world where the good guys don’t always win.

When it comes to crafting stories about kids in creepy peril, Stephen King is… well… king.

The Institute doesn’t start the way you think it will — no mention of main character Luke or the Institute itself for about 50 pages. Instead, we meet Tim Jamieson, an ex-cop from Florida who sets out hitchhiking without a whole lot of purpose and winds up in a small town in South Carolina, where he joins the local sheriff’s department as a night knocker, sort of an unarmed watchman position. Eventually, Tim feels like he’s possibly, finally found a home and a new meaning for his life in this little town.

And that’s the last we see of Tim for a few hundred pages.

The main focus of the story is introduced when we meet Luke, a brilliant 12-year-old about to start MIT, whose incredible mental abilities come with a side of very mild telekinetic power. It’s his telekinetics, rather than his brain power, that make him a target for the Institute and land him in this isolated facility in Maine. The children at the Institute are put through a barrage of shots and sinister tests, all designed to enhance their TP (telepathy) and (TK) telekinesis. During their free time, the kids can hang out, basically keep whatever hours they choose, and do whatever they want, including drinking and smoking. In fact, drinking and smoking are encouraged, since the kids earn vending machine tokens through good behavior, and an addiction is a marvelous motivation to keep earning those tokens.

The purpose of the Institute is slowly revealed, but long before we learn why they’re doing what they’re doing, we know enough to know it’s bad. The treatment of the kids is horrific. They’re subjected to physical and emotional torture and abuse, and there’s very little concern about whether the kids are actually healthy, so long as their TP and TK abilities are honed and developed.

I’m not going to go too far into plot here — as with most Stephen King books, it’s best to just read it and put the pieces together as you go along.

So is The Institute a must-read? Well, for King fans, absolutely. It’s not skin-crawling horror like his recent book The Outsider, but it is still chilling and disturbing and creepy. That said, the book is a bit long, and takes a while to really get going. It took me two false starts before I really got into it, hitting stumbling blocks with the sudden transition from a story about an adult in South Carolina to the main story about the kidnapped children. Ultimately, it comes together and the story really works, but I think there are places where the action could have moved forward a little more quickly.

If you enjoy King’s writing, you’ll enjoy The Institute. As for me, as I always love when Stephen King references himself (and with over 60 novels in print, he has a lot of source material to choose from!). Here’s one example from The Institute that made me happy:

Back in the main corridor — what Luke now understood to be the residents’ wing — the little girls, Gerda and Greta, were standing and watching with wide, frightened eyes. They were holding hands and clutching dolls as identical as they were. They reminded Luke of twins in some old horror movie.

Good stuff.

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The details:

Title: The Institute
Author: Stephen King
Publisher: Scribner
Publication date: September 10, 2019
Length: 561 pages
Genre: Horror
Source: Purchased