The Sixth Nik

by Daniel Kraus

Perfectly aligned for readers of Iain M. Banks’s The Culture series and Ursula K. Le Guin’s “The Ones Who Walk Away from Omelas”, The Sixth Nik is a galaxy spanning adventure from the New York Times bestselling and Pulitzer Prize–winning author of Angel Down and Whalefall.

Deep into space, far past the triworld outposts, beyond range of the lethal trollbot internet, soars The Sickness: a ship woven from biomatter and capable of reacting to every need of its human crew. Sisilla, a nine-year-old cultist with a brain enhanced by arcane tech known as “niks,” has boarded to investigate the enigma of Fém—a plague-riddled planet that has abruptly gone rogue.

The mysterious crew includes a faceless assassin, a beautiful engineer jigsawed by plastic surgery, a peyote-addicted medic, and—most lethal of all—a rugged, NonModded captain with a score to settle with Sisilla. Other dangers abound. A hacked robot begins to believe Sisilla is its daughter. The Sickness itself is mutating, possibly even pregnant. And the secret of Fém is more horrific than anyone could have imagined. To survive, Sisilla will need to forsake her predetermined fate and embrace the unknown.

Genres: Horror, Science Fiction, Fiction, Mystery, Adult, Space, Space Opera

464 pages, Kindle Edition

First published June 23, 2026

About the author

“Kraus brings the rigor of a scientist and the sensibility of a poet.” – The New York Times

DANIEL KRAUS is a New York Times bestselling writer of novels, TV, and film. His novel Angel Down was the 2026 Pulitzer Prize for Fiction winner, a New York Times Top 10 Book of 2025 ,and a national bestseller. His novel Whalefall received a front-cover review in the New York Times Book Review, won the Alex Award, was an L.A. Times Book Prize Finalist, and was a Best Book of 2023 from NPR, the New York Times, Amazon, Chicago Tribune, and more.

With Guillermo del Toro, he co-authored The Shape of Water, based on the same idea the two created for the Oscar-winning film. Also with del Toro, Kraus co-authored Trollhunters, which was adapted into the Emmy-winning Netflix series. He cowrote The Living Dead and Pay the Piper with legendary filmmaker George A. Romero. Kraus’s The Death and Life of Zebulon Finch was named one of Entertainment Weekly‘s Top 10 Books of the Year. Kraus has won the Bram Stoker Award, Scribe Award, two Odyssey Awards (for both Rotters and Scowler), and has appeared multiple times as Library Guild selections, and more.

Kraus’s work has been translated into over 25 languages. He lives with his partner in Chicago. Visit him at danielkraus.com.

Reviews

[Liana Gold]

Set in the future, the female children live to a maximum of 12 years. They peak in intelligence around 9-11 years old and are sent off to complete a task at a distant planet where a small colony was exiled decades ago. The ship the children board is a living and breathing organism all on its own..but things don't go according to the plan.

From space horror, gore, body mutations, I feel this will be a banger!


I am trying to read more science-fiction this year as I feel like this is my weakest genre in terms of how many books I read per year. I am doing another immersive read (physical and audio) because I know this will be hefty in world building!!

[Julia · Rating 5 out of 5]

5 stars, What the hell was that?!!? I was not prepared for how horrifying this was. The cover makes it seem blue and serene. But there’s pus and goo and every content/trigger warning you can think of. I hope you have a strong disposition.

If I had a nickel for every time I read a book this year with screwworms I’d have two nickels. Which isn’t a lot but it’s weird that it happened twice.

I could not have predicted where the plot was going at any point. Highly recommend if you are tired of predictable scifi. There were a couple plot points towards the end that didn't surprise me, but overall I was wowed by The Sixth Nik.

Thank you to NetGalley and the publisher for this advanced copy. All opinions are very much my own.

[Char · Rating 4 out of 5]

A living spaceship. A crew that walks among throatways and lungs with a captain living in its skull. A crew that consists of a heavily modified engineer, a peyote addicted doctor, a Murder, (an assassin), a 9 year old girl, (Sisilla), and a non modified, possibly insane captain. This crew is tasked with investigating a planet that has gone rogue. And this is just the beginning!

I don’t even know where to begin, this story is so wild and the world building so incredible. This is a science fiction story and as most good science fiction does, it features an undercurrent of social commentary that hits hard at times. Women’s rights. Political brainwashing. Obfuscation of the truth for personal gain. Don’t get me wrong, this isn’t some kind of political novel, it’s a horror/science fiction mash up that doesn’t skimp on the blood and gore.

I’m not going further into the plot because it’s too hard to explain. In addition to the imaginative settings, the characters here are well drawn and I was quite attached to a few of them. The empathy I felt for most of them made the denouement even more impactful.

Fresh off winning a Pulitzer for his last book, Angel Down, Kraus tackles important issues of the day disguised as a bloody tale of horror and fantastic fiction, and I am here for it. You should be too!

Daniel Kraus can write in any genre he wants and you can count on him to ace it. Highly recommended!

*ARC from publisher

[domsbookden · Rating 1 out of 5]

DNF 65%

The worldbuilding in The Sixth Nik is meticulous and exhaustive. I had to reread the first few sections just to wrap my head around what was happening—a testament to just how much detail is packed into this world. It's ambitious and demands a lot from the reader upfront.

The writing is also much more experimental than Whalefall, which a greatly enjoyed and gave 5 stars. It took me a while to adjust to the style, and even now I'm still not sure whether I liked it; I suppose when combined with the extravagant worldbuilding, I would have to say the writing ultimately didn't work for me. That said, I still enjoyed the first 30% and was curious to know where the story would go. A particular body horror scene involving an eye was fantastic and exactly the kind of imagery I was hoping for.

Unfortunately, everything that followed felt like the book was spinning its wheels.

I don't call things "shock value" very often because I think the term gets thrown around too casually, but I genuinely don't know what else to call some of the darker material included. To be clear, the content itself did not bother me, it was the lack of narrative justification for it. It's one thing for disturbing content to be interrogated poorly, but it's another for there to be no thoughtful authorial examination of it at all. There was virtually no reflection, thematic development, and connections drawn between the dark elements and the novel's larger scope. It’s very possible that I missed something while wading through the writing and worldbuilding, but without that foundation much of the brutality felt hollow and baseless.

Right up until I decided to throw in the towel with this read, I kept asking myself the same questions: What was the point? What/Who was this for? What was the goal? I kept searching for a lynchpin to tie all of the ideas together but I couldn’t found it, and I wasn't interested enough to keep searching.

If you're looking for a sci-fi/horror read that, in my opinion, does a far superior job of developing crew dynamics aboard a spaceship, I recommend Paradise-1 by David Wellington. Additionally, if you're looking for a sci-fi/horror read that handles a child FMC with more care and has a cleaner thematic execution, I recommend The Girl with All the Gifts by M.R. Carey.

[Dana · Rating 4 out of 5]

Thank you to the publisher for the advanced copy.

I am going to start by saying I don't read much sci-fi. But I am an avid Kraus fan and knew I couldn't miss his next novel.

This is a bizarre story set in a futuristic world filled with characters best described as unique and haunted, many having undergone mutations and enhancements. Kraus is an excellent world-builder, and this story is no different. I could visualize the ship and the horrors to the tiniest detail, accomplished with my own imagination, prompted by Kraus's prose. And please believe when I say "horror" I mean it. Some of the most visceral and gruesome scenes that I've ever read from DK, or from many authors, for that matter. Stomach-churning at times.

I will say there were times I got lost, more my own fault than the author, but the last quarter of the book was a whirlwind of action. I was captivated. A truly original story that I believe fans of sci-fi and body horror will dig.

[Mogsy · Rating 3 out of 5]

3.5 of 5 stars at The BiblioSanctum https://bibliosanctum.com/2026/06/25/...

Daniel Kraus is one of those authors whose stories are rarely straightforward, often featuring ideas that are strange, symbolic, and once in a while even psychologically disturbing. There’s almost always more happening beneath the surface than what first appears, and that’s what I expected from The Sixth Nik. What I didn’t expect, however, was just how demanding it would be. Perhaps the most challenging of Kraus’s novels I’ve read so far.

My following summary will be woefully inadequate because there’s so much I want to say but can’t because I don’t want to give anything away, but I’ll do my best. The story follows Sisilla, one of the Niffakoq, a line of specially chosen children implanted with six experimental brain enhancements called niks. These implants make them stronger, smarter, and far more powerful at reading and understanding the emotions of others. Each individual Niffakoq are also destined to undertake an important and dangerous mission called a Chore before their short lives come to an end, which usually happens around their eleventh or twelfth birthday. But Sisilla has never felt like she fit the mold and knows for a fact she is different. This is because, years earlier, she did the unthinkable by ripping out one of her own niks, and having one less has forever changed what she was meant to become.

Now, at nine years old, Sisilla sets out to undertake her Chore as part of the Niffakoq’s greater calling to serve the common good. She finds herself aboard The Sickness, a grotesque living vessel which will carry her and a motley crew to the distant planet of Fém to find out why this strange metal world that has cut off all contact with Earth. Journeying with her is the ship’s cold and distrustful captain, a beautiful engineer whose body has been rebuilt through countless cosmetic alterations, a warmhearted medic whose quiet wisdom makes him one of our protagonist’s few sources of comfort, and a stoic security officer with a mysterious past known only as Murder 005. And although their trip starts out fairly smoothly, it soon appears that someone is trying to sabotage the mission. The question becomes not whether Sisilla will complete her Chore, but whether she can stay alive long enough to try.

As always, Kraus delivers memorable characters in The Sixth Nik, though in many ways, they’re more important in what they represent. Sisilla is an incredibly complex protagonist, but she’s also tough to process because while she’s technically still a child, you can’t really think of her as one. Niffakoq chosen for this path are made to endure a lot, but nevertheless, as someone with children around her biological age, that fact never completely left my mind. It adds an extra emotional weight to scenes that would already be disturbing if they involved adults. Watching Sisilla endure a relentless string of cruelties and impossible decisions becomes emotionally exhausting, not because it’s gratuitous necessarily, but because the novel does little to soften the consequences of what she’s forced to experience.

The story itself is equally rough. Of course, there were stretches where I was completely absorbed, ready to uncover another piece of the plot or another layer of Kraus’s worldbuilding. At the same time, the pacing wasn’t always consistent. Particularly in the book’s second half, the narrative would occasionally drift into long, abstract passages where I found myself losing my bearings—and some of my interest. There were moments when it felt as though the story was circling the same ideas without moving forward, making it harder to maintain momentum. As such, this is the kind of novel that definitely requires a lot of patience, but to be fair, it rewards you too if you stick with it.

And in the end, I do admire what Kraus was trying to accomplish. I can see how, to many readers, this would be considered a horror novel, and yes there is plenty of gross body horror that made me feel queasy just thinking about it. But its horror is also built around larger ideas about identity and the ways people can become trapped by belief systems they never chose for themselves. As Sisilla begins to understand the truth behind her existence and why outsiders might view her as a cultist, the story evolves into a coming-of-age tale tangled with emotional trauma, physical hardship, and difficult questions about duty and autonomy. The more she uncovers, the more appalling her reality becomes.

Ultimately, The Sixth Nik is another bold novel from Daniel Kraus that is darker and more abstract, but despite its difficult and sometimes frustratingly opaque themes, it’s also one that will stick in your mind for a long time. While I am left emotionally exhausted from reading it, I still came away impressed by its scope.

[Lauren · Rating 2 out of 5]

I started this thinking it was fantasy. It is a little fantasy, a lot science fiction and also horror. My dyslexia made reading this a slog and I hated nearly every moment of it. The book is full of hard to read made up words, it is magic, space and robots. I should have DNF'd, but I won the copy on Goodreads, and I read and review books I am given for free. In fact, the picture of the book I thought I won was not what I got. I got an early copy, so I can't even donate it. I waited to rate and post my review, I knew it was going to be a two stars half way through. Now that the book has been out a couple of weeks... here you go. Maybe you will love the chaos. I very much did not. Especially the r@ping and impregnating of a 9 year old.

[Kaden Love · Rating 5 out of 5]

Brilliant, bizarre, and beyond creative. If you can handle some body horror, I recommend going into this blind for the best experience. Books like this give me hope that there are still unique trad books being published because few people take the bold moves Kraus did in this novel

[Burma Turner]

I won this book in a Goodreads giveaway.
This book just isn't for me. I did not finish at 30%.

[Janereads10 · Rating 4 out of 5]

I felt like my mind broke reading this. My imagination had never been challenged quite like it was with The Sixth Nik, specifically its main setting, a ship called The Sickness, made entirely of biomatter. A word of advice: don't read this on a full stomach. But in all seriousness, The Sickness was unlike anything I'd read before.

This wasn't like any of Kraus's other books. The world-building was dense and the pacing slow, but I stuck with it, because like his other works, I wanted to know what he was trying to say. I was glad I did. The main character's journey was worth it.

Sisilla, the protagonist, is a nine-year-old cultist with a brain enhanced by arcane tech who leads a crew to investigate a planet called Fém. The crew was an interesting bunch. Much like Angel Down, these characters carried Kraus's signature social commentary. Sisilla was meant to remain neutral, but she grew a bond with her crew. Not my usual found family dynamic, but I felt the fondness among the cast.

The settings, both The Sickness and Fém, were horrific in a quiet, creeping way rather than a loud one. The Sickness was sentient and unreliable, and what it did to the crew deepened the horror of the mission. There were moments so astounding I had to put the book down and step away for a couple of hours before continuing. Fém, while seemingly utopian for its inhabitants, was far from it. Its own horror was worth discovering.

Kimberly Woods' narration kept me going through the slower moments and elevated the horrific ones. I'd recommend pairing print with audio. Print for the world-building, audio to carry you through.

Overall, I didn't love this as much as Whalefall or Angel Down, but it was the book that pulled me into space horror. Kraus used the crew to deliver sharp commentary about bodily autonomy, class divides, and religious control. Space horror as a mirror to our world. The character arcs and sheer imagination behind it made it worth the slower patches.

Thank you Saga Press, Simon & Schuster Audio, and NetGalley for my free review copies. All opinions are my own.

[Lorin (paperbackbish) · Rating 5 out of 5]

Thank you Saga Press for my free ARC of The Sixth Nik by Daniel Kraus — out now!

» READ IF YOU «
🩵 love characters with mommy AND daddy issues
😭 enjoy your heart getting blasted to smithereens
💙 want a little (well, a lot) of space horror in your life

» SYNOPSIS «
Sisilla is only nine years old, but she’s spent her entire life preparing for her most important mission to the planet of Fém. With a ragtag crew, she’ll board a ship grown from human teeth (I told you it was horror) and take off for Fém—but there are so many dangers in store along the way, and what kinds of fresh hell await them on the rogue planet itself?

» REVIEW «
Dude. Listen. I’m not a sci-fi girlie, but hear me out when I say that this story is less “science fiction” than it is “horror in space.” I was going to read it anyway because Kraus is a genius, but holy investment in this book and these characters!!!

And on that note, rude, Dan.

Sisilla is a little stiff at first, but you warm up to her specific flavor of precocity. And the rest of the heathens onboard? I adore them. This honestly feels like two books in one when you get to Fém itself, because there’s a whole ‘nother set of horrific hurdles to navigate. And that ending, wow. This story had me gripped the entire time, typical for a Kraus novel, and I highly recommend it. But be forewarned—it is GRUESOME in places. Certainly not for the faint of heart!

I’ve heard a rumor that there’s a second book 👀 so maybe we’ll be blessed with even more of this world?

⭐️⭐️⭐️⭐️💫

[ella reads hella]

One of the most grotesque, invigorating things I've read in ages. I'd give my leg to adapt this. Ga!

[Ryan Lindsay · Rating 3 out of 5]

Thanks to all involved in receiving the advance copy. I’m a fan of Kraus and enjoyed the opportunity to get it. In fact, Angel Down was a favorite read from last year. Sadly, I will not remember this one as fondly.

To be clear, it’s a very well written, fascinating world and my criticisms lay solely in my own personal taste and mood. This novel did not hit me right. Some of the disconnect may be in the cover that, to me implies a sort of high fantasy-ish sci-fi tale when in fact this book is pure horror. Sure, there’s very futuristic elements and a central mystery sorta but at its core, it’s a very grim, very dark (not to be confused with grimdark) very brutal series of escalating scenes of body horror.

Admittedly, body horror isn’t really my thing but my central issue involves the nature of the main character and something that happens about 40% thru the book that made me very unhappy for the duration. It’s terrible, seemingly unnecessary and the book proceeds to wallow in its implications nonstop. In fact, had I know (I won’t spoil beyond that it’s SA) I probably would not have read the book in the first place.

Mr Kraus is an innovator and can clearly write and I’m sure a lot of folks will like this one I just wasn’t one of them. Thanks again for the ARC and the opportunity to support real, human made art, even when it’s not necessarily to my taste.

[Cassie · Rating 4 out of 5]

Progress was necessary. Progress was the whole reason for my existence. It did not matter what fueled it in the end, even if that fuel was hate.

4.5 stars. Although I am by no means an expert on Daniel Kraus’s work, having only read three of his books, one thing I do know is that I’m blown away by his range as a writer. In the high-stakes thriller Whalefall, he took us into a sperm whale’s stomach; in the Pulitzer Prize-winning historical fantasy/horror Angel Down, he transported us to WWI battlefield; and now, in the sci-fi horror epic The Sixth Nik, he introduces us to a future world barely recognizable as our own, as we journey with a cast of intriguing characters through the far reaches of space.

The protagonist of The Sixth Nik is a nine-year-old girl named Sisilla, who was raised by cultists for the sole purpose of performing a specific task to benefit humanity before dying at the ripe age of eleven. Her brain has been enhanced by “niks,” an esoteric type of tech that heightens her intelligence while dulling her emotions and shortening her life significantly. Aboard The Sickness, a ship made of biomatter, deep in outer space, Sisilla is charting towards her assigned task to investigate a rogue planet named Fém. What she finds there – and along the way – has potential consequences for all of humanity.

Nothing about The Sixth Nik is easy reading; in fact, it will likely end up being one of the most challenging books I read this year. The world building is almost overwhelmingly immersive and precise, and there are deeply philosophical, dense passages relayed in Sisilla’s pragmatic voice that require close reading to fully digest. But I found it to be an incredibly worthwhile reading experience, from atmosphere to characters to commentary. The book’s major settings, The Sickness and Fém, are so strange and menacing, each in their own specific ways. The idea of a sentient ship made of human body parts is viscerally unsettling – especially when it begins interfering with its crew in unimaginable ways. Fém gives all appearances of being a utopian society, until it horrifically reveals what’s lurking beneath the surface.

In a technically complex sci-fi plot, rife with the most disturbing body horror I’ve ever read in any book, The Sixth Nik nevertheless serves as a mirror for so many aspects of our lives now – exploring themes of found family and belonging, identity and duty, bodily autonomy, religious control, and cultural and class divides. Sisilla is the perfect character to bring these ideas to the forefront; as she begins to understand the truth about her origins, the book evolves into an emotionally and physically fraught coming-of-age story, and Sisilla evolves along with it. Her character arc is extraordinary.

The scope of this novel, the imagination and inventiveness behind it, are unfathomable. Kraus is a genius and has ruined all other space horror for me; I can’t imagine anything else in the genre living up to The Sixth Nik. Thank you to Saga Press for the early reading opportunity.

[Andi-Roo Libecap · Rating 5 out of 5]

The Sixth Nik is a masterpiece of literary sci-fi. Everything — every single tiny detail — serves a purpose in this story. No words are wasted, and nothing is mentioned without eventually coming back in the most surprising way, altho even at that, every surprise is earned. I could talk about the symbolism and the deeper layers beyond page-level story for hours and it wouldn't scrape the surface of what is happening in this brilliant, philosophically complex book.

Super giant warning that it's not for everyone, of course. Lots of body horror and gore and bloody grossness. We have violence including but not limited to rape here, so tread lightly and protect your heart. Details are not spared. I will say, I don't believe any of it is gratuitous, it's all necessary, and it all has a solid reason to be there. But that is likely to be little comfort to the squeamish or those who have experienced trauma. Any complaints about this are legitimate; i don't wish to downplay the lived exclusive of those who decide this book goes too far. It is, admittedly, A LOT.

One of the things I liked best about this book is that it's almost like three separate stories, because the mc, whom I affectionately refer to as Sis in my head, starts out in one place, travels for a great length of time, and ends up in a third place. The people who love and care for her in each section are all so extremely different from each other and each group have their own agendas, so naturally the story reflects each of the three settings in vastly different ways. Sis is not the same in each setting, either; or rather, she changes and grows as she comes to understand the greater world she's in, and thereby comes to understand herself a little better in each setting. The world building is simply masterful!

I'm not doing this justice, but I hesitate to overexplain that which is best experienced for oneself. Sorry to be overly vague.

Another of my favorite parts of The Sixth Nik is the three characters of Jane, Murder Five, and Doctor Feng. They are drawn so well! Each is a fully expressed person, and so different from each other except in the one thing that they somehow agree on: they come to care for Sis, and she for them. But now I've said too much, dammit! At any rate, they are wonderful, complex characters, actually as are all the other characters, but these three are my favorites. I mean, for obvious reasons.

She gains the most insight from them, and starts to develop her own moral code, to question her purpose, to become a full-fledged individual. If the first setting represents childhood, this section represents adolescence and young adulthood — the college experience, one could say. And the final part is where she finally grows up and uses all the things she has learned, unlearned, and sorted thru, like a true adult.

If life is a journey, and this story truly embraces that concept, then it really is about the friends we made along the way. Don't worry, the book would never be so trite; that's all me.

I listened to the audio, which was marvelously narrated, but I'm so grateful to have received a copy I won in a GR freebie giveaway. This is a book I'm happy to have on my shelf, and one i will be recommending for years to come. I can't wait for the moment when I decide I need to read it again, and this time I pull out the hardback, slowly paging thru it, knowing now what I didn't know when I first hit play.

My god, I loved this book so much!

[Joe Caputo · Rating 5 out of 5]

Absolutely wild. Bloody, intense, and heady. I really liked this one.

[Jonas · Rating 5 out of 5]

This novel is DISGUSTING. Don't be fooled by the calming blue of the cover, or the youth of the protagonist. The first glimpse of the intensity this book offers comes early in the book, when Sisilla, our 9-year-old hero, performs eye surgery on herself. This event is the origin of the book's title: as an infant, six "niks," little nickel sized pieces of metal tech, were implanted in her Sisilla's skull. These niks enhanced her senses, intellect, and developmental velocity. Over time, for some reason, one of them came loose, and lodged itself in between her eye and eye socket, causing immense pain. This little girl, all alone and in the dead of night, uses a butter knife to remove it. The scene is sudden, graphic, visceral. I found myself holding the book at a distance, like when you watch a horror movie through your fingers, as if that would soften the experience. After it was over. I immediately turned and read the passage to my wife to force her to experience the same thing.

This moment is just a taste of the viscerality "The Sixth Nik" offers, and, to be honest, it's one of the lighter moments. My biggest complaint might be it's too gross. Once Sisilla boards "The Sickness," it's a marathon with no respite. Kraus will write a particularly harrowing chapter, and you'll turn the page only to find a new equally disturbing horror.

If you have a weak stomach, this book is not for you. Gore, rape, body horror - all experience through the eyes of a (mature) nine year old girl. But the ideas! The themes! The presentation! It's one of a kind. As hard as it was to read, I love it. Though I think I'll read something light now to recover.

[Sadie · Rating 2 out of 5]

I’m a huge fantasy reader that likes to dabble in science fiction, thrillers, and the occasional horror. However, when I started to read this book it almost felt like a new language with all the new terms in regards Sisilla and her culture. I’d like to coin that with the fact I’m not a huge sci-fi reader as opposed to fantasy, however there is a great deal of world building and jargon that comes along with high fantasy reading. I think for me this was the biggest hurdle for me to really delve into the lore of this book, because every 10 seconds, I had to say “huh?” and question what was actually going on. However, once I got past that (really reading on vibes and hoping it would come together), things really started to get interesting. The ship was absolutely foul, however it offered an interesting setting. This book had so much potential but it felt often disjointed and didn’t have a clear focus. There were also some really huge red flags.


**Spoilers ahead**



...but the fact that a 9 year old girl got raped while in stasis. This was then written off as almost a sick joke because she was “going to die soon anyway.” I really wanted to DNF this book at 40-60% because it got so weird. The robot sex with the captain and the mother- daughter relationship was honestly so not palatable for me.


Thank you to Net Galley for this ARC!

[Rebecca · Rating 5 out of 5]

Reviewed arc in Netgalley. Daniel Kraus's first foray into outer space science fiction brings him back to his dark roots with a genre-blending stomach-churning bio-tech body horror Bildungsroman that may offend his newly acquired Pulitzer readers but will thrill long-time fans. Prepubescent Sisilla, groomed from infancy to carry out an arcane self-sacrifice as the seer of a remote and powerful mystic cult, carries within her skull six mysterious metal tech called niks, but she also bears the shame and fear of having displaced one in a gruesome exit through her eye cavity, leaving an eyeball tinged pink with blood. She carries this sixth nik as a secret talisman through the wild adventure of her assigned Chore, embedded in a biotech space craft grafted together with sickly diseased tissues and strange throbbing organs, with a bizarre crew of misfits and a demented, obsessive captain who reveals the secret of Sisilla's origin. Surrounded by death and disease, trained to sublimate feelings, and destined to die by age 11, Sisilla faces threats no normal child could bear, and through it all, finds her humanity. The Sixth Nik is highly recommended to fans of speculative fiction with caution to readers sensitive to triggers such as violence to children and animals and extreme body horror.

[Paul Preston · Rating 4 out of 5]

3.5 rounded up. The first half of this book was incredible, I was loving every sentence. The second section when Sisilla starts her “Chore” was unparalleled in its nightmare imagery. Seriously messed up but in a most darkly glorious way. It was disturbing as hell, trust me, if this was a movie you would be creeped the fuck out.
Things fell apart in the last section. I had a hard time picturing anything and it felt like a different book, one that I didn’t find interesting at all.

[Lauren · Rating 5 out of 5]

This book is a triumph of absolute horror. It is awful. It is hideous. It reeks of “of course”. Of course it would be young girls turned to sacrificial lambs. Of course the progress of science rides on the bones of hatred. Of course the desperation to live results in death. Of course, of course, of course. It is one of the most repugnant stories I’ve ever read, and it is fantastically put-together. Every Kraus book could not be more different from the last. I love them all so far.

[Carrie · Rating 4 out of 5]

WTF did I just read? Can’t wait to see this made into a film.

[Milda]

I am confused and I don't understand anything lol. Not vibing with the writing style

[BeMandyReads · Rating 5 out of 5]

The Sixth Nik

Wikipedia- Science fiction (often shortened to sci-fi or abbreviated SF) is the genre of speculative fiction that imagines advanced and futuristic changes in technology, scientific knowledge, or biological systems.

It’s always interesting to me when a reviewer says, “I don’t read this genre” and then proceeds to explain why a book is bad even though they just stated it’s not their type of book.
With the current buzz around Whalefall, I feel like The Sixth Nik will end up with reviewers that don’t normally read sci-fi. Or maybe with the success of Angel Down (a Pulitzer!), more readers will be drawn to this book, even thought it’s not their norm.

I knew what I was getting into, kind of. Kraus seems to reinvent himself with each book, mashing genres and blurring lines. As a devote Kraus reader, I’m here for the story he’s telling, no matter the genre. For those that are new to Kraus, know that this one is SCI-FI. The world building is ambitious and fantastic, laying the groundwork for a tale full of horror and humanity.

This book is the story of a young girl named Sisilla, implanted with 6 devices (niks) in her brain that hyper amplify all senses. As a Niffakoq, Sisilla has been groomed for one task, to complete her assigned Chore while she is most efficient (from ages 9 to 11) before her brain swells and kills her.

I want to list each character and how they made me feel, but doing that would give away so much of the story so I’ll just give my recommendations. This book is for readers looking for sci-fi with imaginative world building and complex characters. It’s got elements of transhumanism, cyber punk and climate fiction, to name a few.

Sisilla, Niffakoq 55, is a character that will stick with me forever.


Highly recommend!


Thank you to Saga Press and NetGalley for the eARC.

[sydney · Rating 5 out of 5]

dune for girls?? i can't stop thinking about this. the only author to make me want to cry and throw up in equal measure, following up a pulitzer fucking prize with something this grotesque is so beautiful. i keep expecting kraus to let me down for once and he just...doesn't

[Justin Soderberg · Rating 5 out of 5]

Two things about a Daniel Kraus novel. You never know the genre of his next story, and it's going to be one hell of a book. This is evident in his latest tale, The Sixth Nik , a fantastic blend of science-fiction and body horror. Kraus's first foray into the world of sci-fi is one that will stick with you long after you close the book.

Deep into space, far past the triworld outposts, beyond range of the lethal trollbot internet, soars The Sickness: a ship woven from biomatter and capable of reacting to every need of its human crew. Sisilla, a nine-year-old cultist with a brain enhanced by arcane tech known as “niks,” has boarded to investigate the enigma of Fém—a plague-riddled planet that has abruptly gone rogue.

The mysterious crew includes a faceless assassin, a beautiful engineer jigsawed by plastic surgery, a peyote-addicted medic, and—most lethal of all—a rugged, NonModded captain with a score to settle with Sisilla. Other dangers abound. A hacked robot begins to believe Sisilla is its daughter. The Sickness itself is mutating, possibly even pregnant. And the secret of Fém is more horrific than anyone could have imagined. To survive, Sisilla will need to forsake her predetermined fate and embrace the unknown.

Typically my science-fiction quota is met by reading stories based "a long time ago in a galaxy far, far away...", so taking time to read a sci-fi story not involving Star Wars was something I don't typically do. However, when it comes to books written by Kraus, they are must-read from the start. My favorite of Kraus's stories tend to steer towards the horror genre, that is likely why this unique science-fiction tale hit home for me.

The Sixth Nik is through and through a sci-fi novel, a story built around many different locations, futuristic technology, and unique characters. This is evident from the very beginning and plays well throughout the story. However, it's a great blend of sci-fi and horror, which is exactly the sweet spot I was hoping for. So anyone deciding to grab this book thinking its a straight forward space romp, there is some pretty brutal moments that might surprise you.

Beyond the gruesome horror moments, The Sixth Nik is a story full of action, adventure, and an extremely compelling and meaningful main character in Sisilla. The blend of sci-fi, horror, action, adventure, and a fantastic main characters gives the novel a truly rounded feel and propels you through the pages with ease. Without giving too much away, The Sixth Nik has some amazing storylines that makes each and every page turn worthwhile, landing with an ending that feels fitting but also may leave just enough questions to keep you thinking.

The Sixth Nik is a gripping science-fiction debut for bestseller Daniel Kraus. With a beautiful blend of sci-fi and body horror, this story is just the hybrid of a book that you'd hope for when entering the mind of Kraus.

The Sixth Nik hits bookstores everywhere on June 23, 2026 from Saga Press. The audiobook is available for preorder at Libro.fm!

NOTE: We received an advance copy of The Sixth Nik from the publisher. Opinions are our own.

[Lisa]

hm. I was really all over the place with this one (or maybe it was all over the place with me). For the first third, I thought it might be one of the most brilliant - and DEFINITELY the most disgusting (exceeding the high bar of Whalefall) books I'd read in a long time. Then there's an event at around 40% that led to a portion of the book ~70-85% where I got so frustrated that I thought I might have to give up on it during which an 10 year old who has been raped and thereby impregnated asks for an abortion and is refused one, and seemingly this is endorsed as ok. Happily, that eventually resolved, and then the entire plot resolved in a way I found satisfying in which the twin Joe is found and the gamma dam is being used to exploit his "TRAP" condition to sort of parasitically take resources from the moon...I think, so that tied everything together - but it also sort of collapsed in on itself at the end. I got tired of the degree of bodily mutilation where I didn't understand how anyone could still be alive, much less fighting, given the physical condition they seemed to be in. The tone of the book also changes so much throughout - someone mentioned they saw this filed under horror, and asked me if I thought it was - and portions of this book definitely are to me (screw worms), while there's kind of a chunk late in the book where it slows down and, at least on the surface, is not horrifying.

Also, I can't blame someone for having an homage to The Ones Who Walk Away from Omelas, and you kind of suspect something is coming in that vein and yet... I don't know, that's a hard bar to live up to!

I really enjoyed most of the scifi elements and ideas:
- I was thrilled to read about a new, high tech menstrual product! I almost docked points for the immediate questions that followed it, but wanted to give it a pass. However, when it's later used in the book to basically kill someone by putting it in their skull, it did make me wonder about the safety parameters it would normally have. Maybe there were a couple things like this for me - fun ideas, but not fully explored (which I was fine with except when, like in this case, they were pushed a but further and then kind of didn't make sense).
- woolosis I thought was great, disgusting, and made enough sense to me (I mean, does it really make sense ("Still, these brave doctors isolated a virus that had crossed over from merino sheep, which had been, over centuries, genetically manipulated to never stop growing wool. Unshorn merino sheep were often crushed beneath the weight of their own wool. We never should have created such beasts. Now their problem was ours. "), probably not, but what a good idea!)
- the Snarl (a malevolent future version of the web, which gets more and more plausible & realistic everyday "These were the nascent days of the Snarl, when the free internet was transmuting into a labyrinth of dark alleys from which trolls infected users’ mods.")
-aerotonal travel, although the Nazi part just seemed very goofy to me ("His secrets died with him. No one could replicate Maçon’s alchemy. What they had, however, was Maçon’s working prototype. It was soon discovered that this single existing self-perpetuating loop of sound could be replicated, not unlike how vinyl albums used to be pressed from a single master. Endless sound-powered engines could be created this way. How aerotonal travel worked took a back seat to the truth that it did, in fact, work. ... Every ship in the galaxy, and increasingly beyond, was being powered by a recording of a crowd of Nazis cheering on Adolf Hitler. ... It did not matter what fueled it in the end, even if that fuel was hate.")
- "reputedly 1,800-ton Oort Behemoths floating mysteriously, but passively, near the G-Cloud complex." - possibly my favorite single part of the book?? "The most breathtaking alien creatures ever discovered, the Oort Behemoths were first photographed by the Blackall Telescope amid the icy volatiles of the Oort cloud. They were presumed to be meteors until a stunning series of photographs depicted an eye the size of a sports arena"
- "“Incorrect,” I said. “The oceans are massive. But they are metal.”" - the metal oceans and gemboats were kind of cool. The rust was maybe too much like Spice?? I venture as someone who has not read Dune.
- I mean the Librarians are probably fan service but also, perfect: "If only we had a librarian.” “Librarians are too smart to board a ship like this,” Arzan said. “Don’t be so sure,” Feng grunted. “My wife was a librarian.” For a beat, everyone stopped. Except Feng. He kept working on Murder 005. Arzan stood straight. For once, his disgruntlement softened. “I thank her for her service,” he managed. Jayne clasped her hands. “What a loss for all of us.” ... With the dawn of the first internet, the profession changed to one of navigator, providing maps through the thickening forests of hearsay, misinformation, and conspiracy. ... Librarians rapidly evolved into a fellowship of warrior-poets who gave their lives to the storehousing of human history."

Things that I liked a little less:
- I guess this is a cult book, between the Niffakoq and Nuna Naavoq ("The Nuna Naavoq were not a cult. It was understood that we were a nomadic tribe of Inuit lineage") and the Fem. This isn't my top area of interest, and I think the book came down on the whole former system being an exploitative scam.
- I thought it was kind of funny how some things are explained in such detail, and some things are mysteries: "remote tribe without access to the Snarl and with no previous involvement in biotech, came to possess the six niks remained the triworld’s greatest mystery." (I guess by the end, this is probably just the crass exploitation responsible)
- There were times I liked the writing quite a bit ("Two dozen ships were docked by their noses like fish nibbling at a pond’s surface." - I thought this was pleasantly evocative, although I wonder if it should have been "edge" rather than "surface," although maybe that's implied), and other times less so ("It was somewhat furry, like a backbone ripped from a bear. They called it The Spine." - is the "somewhat furry" here meant to indicate it was furry on one side? I think in general if backbones are ripped out, the skin/fur isn't coming with. I dunno.).
- Honestly I'm not sure I understood Omni:Bŏtic beyond "evil corporation"
- Arzan was just pretty disgusting
- Toward the end, I felt like I understood some parts less, and I wondered if the book just didn't explain them as much: "They shared their own theories of the corpse cloud, which they called the marrowsphere, none of them very convincing. ... “The marrowsphere,” I said. Talfa gestured impatiently. “And? How did they come to darken our sky?” “Did your lyfe create wormholes?”"

I think that Mary Roach is acknowledged in this book gives the reader a lot of insight.

[Kristin · Rating 5 out of 5]

Nine-year-old Sisilla has been trained by a cult since infancy that she is destined for a chore that will end her short life. She also has “niks” embedded in her skull that allow her to gain information from the people she encounters. Her chore takes her aboard The Sickness—a tumor-like spaceship with a diverse crew. They are headed towards the planet Fém that is inhabited by Earth’s outcasts with an incurable and deadly disease. Sisilla will need to use her abilities to discover the truth of the secretive society and what she values most. With well-developed characters, this immersive, dark but hopeful sci-fi horror read will disgust and touch the reader.

This ARC was provided by the publisher via NetGalley in exchange for an honest review. 

[Tammy - Books, Bones & Buffy · Rating 5 out of 5]

The nitty-gritty: A masterfully written and plotted sci-fi horror story, The Sixth Nik combines grotesque imagery and body horror with unexpected depth and emotion.

One thing I’ve come to expect with a new Daniel Kraus book is that I never know what to expect, and The Sixth Nik is yet another great example of Kraus’s versatility as an author. This book isn’t going to be for everyone, though. It’s science fiction, but it’s also space horror, with an emphasis on the horror. There are also a host of potential triggers that sensitive readers might want to know about, including extreme body horror, abortion, bug horror, rape, dog death and one more rather controversial trigger that I don’t want to reveal due to spoilers (but ask if you’re curious). But aside from these dire warnings, The Sixth Nik is also one of the best books I’ve read this year, with immersive and creative world building, deep character development, and a thrilling plot that never really lets up. Kraus is an extraordinary writer, and I’m hoping his recent Pulitzer Prize win increases his readership, because he deserves it.

Nine year old Sissila is the 55th Niffakoq, chosen as a baby to serve her people, the Nuna Naavoq. Each Niffakoq, always a female, has alien tech—six small metal nickel-sized devices called niks—implanted in their prefrontal cortex, which gives them strength, intelligence, and the ability to “nik” people—sense their emotions and detect lies and ill intentions. Most Niffakoq only live to be eleven, and when they die, the six niks are harvested and inserted into the next Niffakoq. At age nine, the Niffakoq is sent on an important mission called a Chore, something that will change the future, like curing disease, for example, and Sissila is about to embark on hers.

Sissila is keeping a big secret, though. Several years ago, she lost one of her niks (the book’s first incident of body horror). The removal of this sixth nik gives her the unusual ability to feel emotions, something that was suppressed when all six were intact. With this sixth nik hidden away in a pocket, Sissila prepares to leave home to complete her Chore, which will take her on a two year journey through space to a planet called Fém.

Sissila and her crew—Engineer Jayne Mae Marilyn Bardot, medic Feng Chaon, her personal body guard Murder 005 and the ship’s Captain Creg Arzan—have been assigned to a plasmagraphic ship called the Sickness, and they’ve been instructed to make contact with the settlers on Fém, plague victims who were sent there to keep the rest of the triworld safe from a deadly disease. But although their trip starts fairly smoothly and Sissila begins to bond with her crewmates, someone is trying to sabotage the mission. The question becomes not whether she will complete her Chore, but whether she’ll stay alive long enough to try.

The Sixth Nik is full of detailed, complex world-building, and the plot itself is almost impossible to sum up (I did a poor job of it!) because so much happens. There’s enough here for a duology, to be honest, yet Kraus managed to write a complete story in under five hundred pages. Kraus’s world is spectacular, a future full of both familiar and unfamiliar SF tropes, but even the familiar elements felt fresh. I was reminded at times of various books and movies, like Alien, The Abyss, Ender’s Game and others, but for me, it never felt derivative. Take the Sickness, for example. I’ve read plenty of stories with living space ships, but Kraus’s plasmagraphic ships are both gross and fascinating. The interior of the Sickness is like being inside a tumor, with slick walls and floors that envelop the crew. It’s “built” using each crew member’s DNA (don’t ask) and molds itself to be whatever the crew needs most.

I also loved the way the author put every object in the story to good use and doesn’t forget about them, like some stories I’ve read. For example, the sixth nik that Sissila carries around in her pocket plays an important role at the end of the story. And the Niff Six, the six questions she must ask everyone she meets, seem random at first but eventually they come to have deep meaning. 

Sissila is such a great main character, and I had to keep reminding myself she was just a child. During the course of the story, she changes from an unfeeling tool who has been groomed to be her people’s champion, into a caring, curious girl who discovers the joy of friendship. Some of my favorite moments were on board the Sickness after she meets and gets to know the crew. Jayne, a heavily modded woman, gives Sissila her first make-over, complete with a wig (Sissila is bald because of her nik surgery), a very sweet, “older sister” type moment. Feng learns her secret but vows not to tell anyone, a concept Sissila can barely comprehend. And Murder 005 charms Sissila with his pet dachshund Positive Roy (although don’t get too attached to him ☹️).

As for the horror elements, they were unexpected and extremely disgusting at times. I don’t want to reveal too much, but the “bug horror” scene I mentioned earlier was certainly one of the most memorable. So was the disease that the people on Fém suffered from, a sickness called Wolosis that comes from Merino sheep, and I’m still gagging whenever I think about what it does to the human body. Equally disturbing is a shocking scene aboard the Sickness involving the ship itself.

But all these scenes (and many more I haven’t mentioned) serve the story and have purpose, and that’s what I love so much about this book. Kraus hasn’t necessarily added them for shock value, but he’s come up with a futuristic scenario where they make sense. He’s also woven timely themes into his story, like body autonomy and a woman’s right to choose. The ending was not what I expected at all, but it made sense for the characters and the story, and the final emotional gut punch left me speechless. Readers who love challenging stories will not be disappointed.

Big thanks to the publisher for providing a review copy.

[Amanda Larson · Rating 5 out of 5]

I wasn’t really sure what I was getting myself into when I started The Sixth Nik. It definitely wasn’t something I would normally have chosen to read, but I figured I would try something new.

I am so glad I did! This was such an excellent sci-fi/horror/action - almost too many genres to name. The main character was written with such great detail and the entire cast of characters was wildly diverse.

The storyline was strong and the book overall was an unsettling, roller coaster of a ride.

Thank you to NetGalley and Saga Press for the ARC in exchange for my honest review!