Caput Mundi: The Head of the World (Enarii)

Caput Mundi #1

by B.R. Kang

When Niil Terra sets off to find his missing parents, he ends up in Caput Mundi, a dazzling place filled with flourishing innovation and alchemic wonders. It is also the home of enarii, a shape-shifting metal that can be willed into any shape, whether it be swords, forks or fly swatters. As Niil’s talent for shaping enarii emerges, he discovers something he’s never had before: a place where he belongs.

But when secrets about enarii—and Niil’s parents—begin to surface, he is faced with an impossible choice that could cost far more than he’s prepared to lose.

Caput Mundi: The Head of the World is an upper middle grade fantasy adventure for ages 9-12. This epic quest blends action, elemental powers, and friendship into a hopepunk story about perseverance and standing up for what’s right, even when the world feels impossibly big.

Genres: Fantasy, Middle Grade

275 pages, Kindle Edition

Published March 17, 2026

About the author

B.R. KANG is a 1.5-generation Korean-American, unapologetic foodie, Harvard alum, and constant daydreamer. Her debut novel, “Caput Mundi,” has been nearly twenty years in the making—rooted in what-ifs, countless revisions, hundreds of rejections, and a stubborn belief that good stories are worth fighting for.

When she’s not writing, she’s in the kitchen experimenting with recipes or exploring flavors from around the world. For more, visit her website CaputMundiBooks.com.

Reviews

[The Page Ladies Book Club · Rating 5 out of 5]

I think I’ve found the ultimate "I wish this was real" magical object, and I’m officially ready to move to Caput Mundi! 🗡️✨

In Caput Mundi by B.R. Kang follows Niil Terra on a quest to find his missing parents, which leads him straight into a city of alchemic wonders and innovation.

The star of the show? Enarii. It’s this incredible shape-shifting metal that responds to your will. Need a sword for a duel? Done. A fork for dinner? Easy. A fly swatter because well, bugs? You got it! Watching Niil discover his talent for shaping this metal and finally finding a place where he belongs was so heartwarming.

But of course, it’s not all alchemy and sunshine. Dark secrets about his parents and the enarii itself start bubbling up, forcing Niil into some seriously tough choices. It’s such a high-stakes hopepunk story about standing up for what’s right, and the friendship dynamics are top-tier. If you love a good epic quest with a unique magic system, you need this on your shelf!

✨️Thank you Books Forward PR and B.R. Kang for sharing Caput Mundi with me!

[Vic Liston · Rating 5 out of 5]

I’m not sure that using the term ‘unique’ is quite strong enough to describe the magic of Caput Mundi. There is a sense of familiarity, created in large part by the humanness of the characters, yet the magic itself wildly different and wildly inventive, creating a storyline that reels you in and keeps those pages turning.

Kids and adults alike will adore Niil, and the supporting characters around him bring depth, balance and complexity to the vividly imagined world around them.

Much like enarii, this story seeps in, settling deep in your heart and mind.

[Iron John · Rating 5 out of 5]

Okay, I read this one with my little brother (for "research," I told myself), and we both ended up fighting over who got to hold the Kindle.

The hook is quite brilliant actually, a kid named Niil Terra goes looking for his missing parents and stumbles into this hidden city called Caput Mundi. And the first thing you notice? Everything runs on Enarii, this shape shifting metal that you can basically think into being whatever you want. Swords? Sure. A fork? Yupp.

My brother’s immediate reaction was "I want Enarii for my birthday." Same, kid. Same.

The writing moves fast, short chapters, clear action, no bogging down in description. The friendship dynamics feel real (kids tease each other, mess up, apologize). And the mystery unfolds at exactly the right pace.

So what’s the bottom line? Well, it’s a fun, heartfelt adventure about finding your people and making impossible choices. Highly recommended if you want to sit and read with your little siblings, nephews, and nieces. Plus, you'll actually enjoy it too. No eye rolling at bad writing or predictable plots. It's genuinely solid middle grade fantasy that respects both you and the kid.

[VeroniCanRead · Rating 5 out of 5]

4.5 True Rating | ARC Review: An incredible book about the adventures of Niil as he searches for answers and his father, finding friendship, adventure, and even more questions.

🌎 For Fans of:
- Middle Grade Fiction
- Fantasy
- Adventure
- Friendship
- Fighting for what is right
- Uncovering secrets
- Searching for parents

✏️ Spoiler-Free ARC Review
Growing up, my favorite book was The House of The Scorpion by Nancy Farmer, a book that won multiple awards and had me reading it every year for a decade.

This book, Book 1 of Caput Mundi, reminds me of House of the Scorpion in so many positive ways because it’s an adventure that goes beyond kids just being kids.

Originally going out to seek answers about his father and his own kidnappers who disappeared, male main character Niil becomes a piece of a much bigger puzzle — one that leads to more questions.

There are budding friendships with other children, adventure, fighting for what is good and right, and an entertaining world with fictional elements that humans can wield.

Even though it’s a middle grade book, as a 31 year old female, I really enjoyed it! It was fantastical enough to get into but still complex enough and well written in a way that never made me feel bored or overwhelmed.

📖 Should My Child Read This?
I say yes! It’s definitely a middle grade book since there are instances of fighting (hand to hand and with weapons), death (not vivid descriptions, some off-page), and the fight between good and evil. There aren’t any religious elements nor any romantic/sexual elements (not even kissing) but there are larger questions and moral dilemmas of doing the right thing even when it is difficult and dangerous.

🖤 Thank you to author B. R. Kang, NetGalley for the digital advanced copy, and Books Forward PR for the physical advanced copy. As always, my reviews are honest, my own, and voluntary!

📘 Book: Caput Mundi, the Head of the World
📚 Series: Caput Mundi, Book 1
📅 Release Date: March 17, 2026
⭐ Rating: 4.5 out of 5
✅ I would recommend to YA readers and adult readers!

[Books Forward · Rating 5 out of 5]

The world of Caput Mundi is vividly drawn, and the message about finding your voice and standing for what’s right is handled with heart and honesty. There’s action, mystery, humor, and even a few well-earned emotional punches.

[Ashley · Rating 5 out of 5]

CAPUT MUNDI: THE HEAD OF THE WORLD (ENARI) captures everything to love about YA and Middle Grade magic and fantasy. This story follows a young boy, Niil, as he journeys through Caput Mundi in search of his parents. Caput Mundi is a magical world filled with action and elomental magic. The main eloment that shines is enarii, a black metal-like manmade element. A whispy eloment that Niil can control that he can will in to just about anything. Think along the lines of how benders in Avatar: The Last Airbender bend elements.

I really loved the worldbuilding. It feels natural and never overwhelming. As Niil learns about elemental magic and the workings of Caput Mundi, the reader learns alongside him, which makes the experience feel immersive and age-appropriate in a really effective way. The knowledge unfolds exactly as it would for a young boy discovering this world for the first time. This new magical world also isn’t built on a simple good vs. evil divide. This book shows it can be more complex than that; any group can have both good and bad people. The lines between them are often far from clear.

What really stuck with me is Niil’s journey itself. Beyond all the magic and adventure, there’s a really solid emotional core about growing up, finding your identity, and figuring out who you are on your own terms.It never feels too heavy, just honest and engaging, with a nice balance of action, mystery, humor, and heart.
Overall, CAPUT MUNDI: THE HEAD OF THE WORLD (ENARI) is a really well-crafted fantasy that captures everything I love about YA and Middle Grade stories, fun, imaginative, and surprisingly meaningful.



For Fans Of: middle grade fantasy, elemental magic/powers (like ATLA), adventures

[Sadie Steffens · Rating 3 out of 5]

I picked up an ARC of Caput Mundi because my 7-year-old daughter was drawn to the premise, and it completely captivated her. The world-building is the standout feature here. It revolves around enarii, a rare, shape-shifting black liquid metal that users absorb through their skin and mold with their minds. Watching the main character, Niil, learn to control this magic while uncovering shocking secrets about his parents makes for an exciting quest. While my 7-year-old was glued to the story, the writing feels a bit juvenile for upper middle-grade readers. I suspect it would be a bit too young for my 9-year-old to fully enjoy, but it hits the sweet spot for a slightly younger, early-middle-grade audience.

Unfortunately, the audiobook format was a miss for me. I listen to a lot of audiobooks, and it is not often that a narrator is a miss for me, but this was one of those times. Instead of an exciting, action-packed fantasy, the delivery felt like a soft lullaby or bedtime story. Furthermore, the character voices the narrator chose often came off as obnoxious. My daughter, however, did not seem to mind the narration.

Overall, Caput Mundi is a fun, imaginative, and highly visual fantasy for younger kids, but you might want to opt for reading the physical book rather than listening to the audio version.

[Debi · Rating 5 out of 5]

ARC REVIEW

Caput Mundi: The Head of the World by B.R. Kang is a magical middle-grade fantasy filled with adventure, mystery, and heart.

When Niil Terra sets out to find his missing parents, he discovers Caput Mundi—a fascinating world powered by enarii, a shape-shifting metal that can become almost anything. As Niil learns to harness this incredible power, he also discovers something he’s been searching for his entire life: a place where he truly belongs.

I loved the imaginative world-building, unique magic system, and themes of family, identity, courage, and sacrifice. The mystery surrounding Niil’s parents kept me turning the pages, while the friendships and character growth made me emotionally invested in his journey.

As a 5th-grade teacher, I can easily see this novel being used in the classroom to explore character development, theme, conflict, and world-building. It would make a fantastic literature circle or independent reading choice for fantasy-loving readers.

If your readers enjoy Percy Jackson, Amari and the Night Brothers, or The Last Cuentista, add this one to your TBR!

📚 Recommended for ages 10–14
✨ Magic
🗺️ Rich world-building
❤️ Found family
🔍 Mystery
⚔️ Adventure

Thank you to the author and NetGalley for the ARC.

[Aimee · Rating 4 out of 5]

Thank you so much to Books Forward for the ARC🤍
⭐️⭐️⭐️⭐️ (4/5)

Read if you like:
• Middle grade fantasy
• Adventure to a new world
• Elemental powers

Caput Mundi by B. R. Kang perfectly captures what I love about middle-grade fantasy. It has just the right amount of stakes to keep the story exciting without making the world feel too complicated, while still letting the imagination run wild. I also loved how the story highlights themes of family, friendship, and self-discovery!

Niil’s journey to uncover his family’s secret hooked me right from the beginning. The story opens in such an intriguing way that I immediately wanted to follow him on this adventure! Niil is brave, strong, and a little naive in a way that makes him incredibly easy to root for. I kept wanting to protect him while also cheering him on as he discovered more about himself and the world around him!

I also enjoyed how the other characters were introduced throughout the story. Whether they were friends or enemies, each one added something interesting to the plot. The story itself is easy to follow but still has some surprising moments. I definitely did not expect the plot twist!! Watching Niil and his friends, Ada and Soes, work together and fight for what is right made the adventure even more fun.

The elemental power system was also really cool. The way the characters control the substance called enarii actually reminded me a bit of Venom from Spider-Man, which made it even more fun to imagine while reading😆

Even though the story is full of adventure, I also appreciated the quieter moments where Niil slowly learns more about himself. There were plenty of heartwarming moments and bits of humor that balanced the action really well!

Overall, this was such a fun read and a great middle-grade fantasy adventure. I would definitely recommend it!

[Agnes Odek · Rating 4 out of 5]

Kang B.R. takes readers on an enthralling adventure through Niil. Kidnapped to pay her father’s dues, he starts to live a different life from what he is used to. Abandoned at the hands of his polite kidnappers, he learns to use Enarii. This leads to his journey to Caput Mundi, where all he has ever known is challenged.

Caput Mundi: The Head of the World entrances readers with its simplicity. From fighting for what is right and discovering undisclosed pasts, this book shows the importance of standing for your truth. The character's resilience is admirable and worth emulating. I highly recommend this book.

[Pine Reads Review · Rating 3 out of 5]

“Niil didn’t say anything. It wasn’t good to make promises he couldn’t keep.”

Eleven-year-old Niil Terra gets kidnapped by his father’s debt collectors—Mira and Marcus Marcellos—and is held for a ransom that his father never pays. In their care, Niil learns all about enarii—an eloment that can only be found in Caput Mundi—after he learns he has a special ability in addition to controlling the element. His time with the Marcellos comes to a sudden end when his father finally sends a message back to Mira and Marcus, who leave Niil to go hunt him down. Not long after, Niil meets Ada, Mira and Marcus’s daughter and a prodigy at using enarii, who is searching for information on the Doubleyes and their connection to her parents. Niil follows her to Caput Mundi, where they get roped into a world full of greed and injustice. Only one thing is certain: no one is what they seem.

I think this series—this world—has a lot of potential. Unfortunately, it just was not for me. Niil was my favorite part of this book, and I’ll be thinking of him for a long time; he's a great representation of what parental neglect or abuse can do to a child. I still remember thinking, “This kid is acting way too mature for an eleven-year-old,” then immediately afterward, “Well wait, so was I after everything I went through.” I think for young readers, Niil is an excellent way to broach that topic. However, I did feel like Niil was relatively passive in this book. Yes, he was the one who decided to jump into action; he decided it’d be better to do things himself than wait for the adults. But that moment came much later into the book, and during most of this novel it felt like the story was happening at Niil, rather than it being Niil’s story. Something I did really appreciate by the end was how there isn’t any “good versus bad” in this world; every group consists of good and bad people, and a lot of the time it isn’t obvious who's who. Many of the twists came from finding out someone wasn’t who they seemed, and it was really fun to see that play out. I only wish Niil had a more emotional response to those reveals. Despite my gripes, I do think Caput Mundi is an interesting world that has much more to explore—good thing this is book one of five!

Caput Mundi, The Head of the World: Book 1: Enarii releases March 17th, 2026.

Pine Reads Review would like to thank Books Forward and AP Creative LLC for sending us an ARC in exchange for an honest review. Any quotes are taken from an advanced copy and may be subject to change before final publication.

Follow us on Instagram, Twitter, TikTok, and Facebook @pinereadsreview, and check out our website at www.pinereadsreview.com for reviews, author interviews, blogs, podcast episodes, and more!

[Tonja Drecker · Rating 5 out of 5]

With a very original, magical direction, this is an adventure about discovery...and that in so many ways.

Niil's been kidnapped and brought to a very strange place. The kidnappers hope that his father will come for him and return what he's stolen, but Niil's family life isn't exactly golden. Instead, the kidnappers are kinder than expected and treat Niil like their own child. When they finally go after his father, they never return and Niil accompanies their true daughter to search for them. Plus, he needs to learn more about his own mother and history. But the journey isn't what they expected, and not only are there constant dangers, Niil discovers the magical substance called enarii and learns of his own, special powers.

From the very first page, it's clear that this is a fantasy read, which takes an unique direction. Not only is the world different, but the characters seem to never be what a reader might expect. But then, the characters are often not what they first appear to be and carry secret intentions. This keeps the plot on its toes and guarantees many twists and turns. Then, there's enarri. This magical element embraces so much: a magical tool, currency, part of characters' lives and so much more. Niil's own hidden past intertwines with enarri in ways which leave much to be discovered during the rest of the series. Plus, this isn't a light read. There's betrayal, fights, danger, death, and constant secrets to be revealed. Yet, the author keeps it in the solid realm of middle grade fantasy.

While the fantasy aspects stay high, there's more to this book than just magical adventure. This first book seems to slowly step into the characters, leaving them at arm's length until the later pages of the book. It's as if the reader needs to get to know them first. Plus, there is quite a bit of underlying depth in everything. For example, Niil comes across as mature for an 11-year-old, but as the terrible relationship with his father is made clear, Niil's attitude makes sense. There's also a large dose of society disparities. In this realm, there are clear social levels with the lower ones suffering. It surprised me to discover a revolutionary group, of sorts, which can use pretty harsh means to meet their goals. So, there are some heavier directions in this first book, which signal some unique themes not often seen in the middle grade realm. And there are also messages surrounding the need to stand for what is right and determining when something is evil.

Summed up, this is an original, fantasy read with tons to offer and even more to come. Anyone who enjoys unique magic, social unrest, finding yourself, secrets, fights, adventure, and more will want to give this book a go.

[Patricia N. · Rating 3 out of 5]

Caput Mundi
by B.R. Kang, author
Narrated by Laura Clifton

Rating: 3 star rating

This book started out really strong for me. The opening immediately caught my attention, and I was intrigued by Niil Terra and the world he lived in. One of the most interesting parts of the story was the Enarii, a black liquid metal that people can absorb into their bodies and shape into different tools and weapons using their minds. It was a unique idea, and I enjoyed learning how it worked and how it affected the people who used it.

Niil Terra was an interesting character to follow as he became caught up in the larger mysteries and conflicts surrounding the Enarii. The world-building was detailed, and there were plenty of questions that kept me wanting to know what would happen next. The author clearly put a lot of thought into the setting and the magic system.

Unfortunately, about halfway through the book, the story began to feel repetitive to me. A lot of the focus stayed on the Enarii, the environment, rain, fire, and similar themes. While those things are important to the story, I found myself wanting more variety in the plot and more scenes showing everyday life and interactions between the characters. It felt like the story spent too much time circling the same ideas instead of moving forward.

I also felt the book could have reached its conclusion sooner. The ending wasn't as satisfying as I had hoped, and I would have liked a stronger ending after all the buildup. By the time I finished, I wasn't sure I was interested enough to continue with the next book in the series.

I originally started with the audiobook narrated by Laura Clifton, but I only got through Chapter 2 before I ran into an error and couldn't continue listening. The narration was perfectly fine in the chapters I heard. Because I enjoyed the beginning so much, I bought the ebook and finished it that way.

Overall, I think Caput Mundi has a lot of potential. The opening chapters, Niil Terra's story, and the concept of the Enarii were all very creative and kept me interested. I just wish the second half had moved a little faster and offered more variety before reaching the ending. I do hope the author keeps writing because there is definitely talent here.

Thank you, NetGalley, APCreativeLLC, and author B. R. Kang and Laura Clifton, narrator, for this book review consideration. All review opinions and information are my own.

#NetGalley
#APCreativeLLC
#CaputMundi
#BRKang author
#LauraClifton narrator

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[Mark Buxton · Rating 4 out of 5]

What worked:
The most creative part of the book is a substance called enarii. Characters use it freely for a myriad of purposes, and it’s used as currency to buy things. People can absorb it into their skin and use it to form any object they can visualize. Niil is the main character, and he has a rare ability. He can sense the presence of enarii and draw it to himself. The substance seems alive at times, as it starts to move when he’s nearby. Niil learns that the only other person with his ability is his mother, but she left home four years ago. Readers will discover more about enarii as events unfold, as it’s the most important substance in the world. Other secrets await.
Ada joins the cast early in the story, but she has a contrasting outlook on the world. Her parents kidnap Niil in the book’s opening, but they care for him like their own child. Ada is bitter toward her parents because she thinks Niil was treated better than her. She notifies him of her parents’ murder and sets out to locate those responsible. She suspects it’s a secret group called the Doubleye. Ada isn’t very forthcoming with information, so it takes a while for readers to understand her character. She has a rare allergy, but she becomes a loyal ally to Niil.
The underlying conflict concerns societal issues involving entitled people and citizens who’ve been wronged. Many citizens in the empire are unhappy with the leadership, and some are actively rebelling. The Doubleye encourages unrest and chaos, and they’ve set off explosions and fires in public places. Niil and Ada, as well as her cousin Soes, eventually meet members of the Doubleye, although they don’t fully understand what’s happening. Yes, Niil’s mother is a member of the rebel group, but there are complications. Niil is conflicted about his mother’s role, and the Doubleye now has more radical ideas. Readers will be surprised as characters’ motives come to light, and unexpected twists ensue.
What didn’t work as well:
Perhaps there are too many surprises, as it seems like readers don’t fully know characters until the book ends. There are even truths that characters don’t know about themselves. On the other hand, it’s nice that the plot isn’t completely predictable.
The final verdict:
It’s wonderful when readers discover a book with unexpected ideas. Niil is a delightful, naïve underdog who is determined to save innocent lives and find his mother. I recommend readers try this book for themselves.

[Akanksha S · Rating 4 out of 5]

Sometimes we think we control things, but really, those things control us.

The story is about a boy named Niil. He is kidnapped by Marcus and Mira due to his father’s debt. They take him to a place called Umbra, which is a decaying island. There, he finds something called enarii. It is a special liquid metal that can turn into anything. Basically, enarii is venom plus nanites, similar to what you might have seen in sci-fi movies. While they are on the ruined island, Niil's captor sends multiple ransom letters to his father, but never gets any response from him.

Later, he discovers that he can control enarii, as he inherited the gift from his mother. What looks like an amazing gift slowly reveals its dark side. People in the rich place, Caput Mundi, use it all the time. But people in Umbra hate it because it caused a big disaster. Also, he finds out that his captors were his mother's teachers. So, he develops a special bond with them. One day, Niil’s father sends a message, and Marcus and Mira decide to go find him.

Months pass, but Marcus and Mira do not return. One stormy night, a strange girl breaks into the house and attacks Niil. She claims that Marcus and Mira are his parents, and they are no more. Niil struggles to accept the news and to find out the truth; he decides to leave Umbra and go to Caput Mundi.

The author has done justice to the character development and world-building. As Niil isn't a typical hero who fights everything. Instead, he adapts. However, he is shown as more mature than his age. Whereas Ada is angry and strong. Marcus and Mira are confusing. They kidnap Niil, which is wrong. But they also take care of him and teach him. So they are not just good or bad. The most interesting character is Linus. He is not a simple villain. He is smart, damaged, and full of rage.

Caput Mundi is a smart, honest fantasy. Highly recommendable to YA because it will enhance their imagination and positive attitude towards repairing the bad situation. One strong line near the end captures it: “There’s hope. There always is."

[Kelly {SpaceOnTheBookcase] · Rating 4 out of 5]

Niil Terra is an eleven year old boy who has been kidnapped by his father's debt collectors. Though Mira and Marcus are kind to Niil, he sends letter after letter to his father hoping he'll be rescued. After nearly a year has passed, Niil’s captors leave for a mission they don’t come home from. Instead, their daughter Ada shows up curious and cautious of Niil. Together they head for Caput Mundi where Niil is hoping to find answers about his parents. Along the way they find the Doubleyes, a gang set to take down the Empire, and things go from bad to worse. In an effort to stop the Doubleyes from carrying out their plans, Niil and Ada learn that everything they think they know isn't exactly what they know.

Caput Mundi is a fantasy world set in what would have been Rome-like with a magical power system filled with enarii; a metal-like substance that can be transformed into anything you can think of. People work in the mines to get more enarii, but the toxins the mines produce have devastating effects on the people and the surrounding land. Similar to a caste system, there is a have and have nots within this fictional world.

Niil is a mature eleven year old, and that comes from being abandoned by his mother and neglected by his father. Used to always being on the run with his father, getting kidnapped actually gave Niil stability he never had. I enjoyed watching his character grow as he learned more information. Ada, who's similar in age, is a strong FMC who is willing to fight first and ask questions later. Witty and funny, her tough girl exterior was endearing. Ada's cousin Soes provided a good balance to the trio as they ask questions first and then do something in person.

This series is just getting started and I'm excited to see where it goes.


Thank you to Books Forward for the gifted copy.

[Antony Wairiuko · Rating 5 out of 5]

Suspenseful Plot Twists

Setting the pace for the magical fantasy, the chapter Owed and Taken describes the events that prompted a couple, Marcus and his wife Mira, to trick and kidnap an 11-year-old boy called Niil. Niil's father owed the couple and by kidnapping him, they wanted to force the father to pay what he owed them.


The couple retreats to an island village, Umbra, from where they send distress letters to his father whose whereabouts are unknown. A year later and after settling down to village work life, the boy sees a dark metallic liquid coming from the earth. The rising liquid approaches him and hangs in the air. It can be shaped into anything. And the boy can control the substance as seen in the cover art. 


Interestingly, Marcus had mentored the boy's absentee mother, Regina, to control the substance and she was among the best; in turn, the boy had inherited her controlling skills. Niil also learns more about his maternal history from Marcus. 


A fire incident ends the couple's lives, setting the stage for the dramatic meeting between Niil and the couple's teenage daughter whose quest is to unravel her parents’ deaths, why they were in the village and to accomplish what they couldn't -- “bring your father here.”  Meanwhile, Niil wants to trace his father so he can pay the debt as per the couple's dying wish. Thus begins their eventful journey to the title-inspiring magical land, Caput Mundi.


Regina's suspected hand in the couple's fate and the details about the criminal group she founded, which tries to recruit the boy, are among the interesting plot twists. 


The ensuing events make for a good, suspenseful story.

[Priyanka Kedia · Rating 4 out of 5]

Caput Mundi: The Head of the World by B.R. Kang is a classic fantasy adventure story that is a great read for younger readers, both who are familiar with the genre and those who are new to it. The story follows the tropes of middle grade fantasy, as it follows Niil on his journey of self-discovery and growth, even when it comes with pain. And this is exactly what makes him a likeable character, someone readers can easily identify with. We also see him make friends and enemies through the process, and lean on them when things get difficult. One of the strongest elements of the book is the protagonist’s discovery of his family history. Niil’s discovery of his parent’s lineage and the secrets they are hiding are something readers will probably not be able to guess until the very end.
The book has a fast-moving plot, but as a reader, it would have been nice to see a broader variety of external challenges befall Niil and his friends. Currently, most of the obstacles Niil faces are tied to his internal struggle with identity. Having a few more physical or environmental hurdles could have heightened the stakes. However, this focus on self-discovery makes the story deeply resonant for its target audience. T
The writing is easy to access and fun to follow, ensuring that middle-grade readers remain engaged without feeling overwhelmed. And the book is a great start to a promising new series, one readers will probably not be able to wait for.

[M Shen · Rating 3 out of 5]

thanks to netgalley and the publisher for an arc of this book. all thoughts and opinions are my own.

this was such a cute & fun book! a fast-paced middle-grade fantasy with one of the most unique settings i’ve read about in a minute.

Nill was a sweet, determined MC with a green thumb and a tendency to see the best in the world. his interactions with his new friends were adorable.

people need to take more stock in middle-grade worldbuilding! it wasn’t as fleshed-out as it could be, but it served the story well and more kept getting revealed throughout the story. i enjoyed the references to ancient imperial Rome but there weren’t that many; i would have liked to see more. hopefully the rest of the series will explore it bc most of the book wasn’t even set in Caput Mundi itself (even tho the few chapters that were give plenty of character to it). enarii and all the other elements were a really interesting aspect to the world too.

the writing, esp the dialogue, could get a bit repetitive at times, which might’ve been more annoying bc i listened to the audiobook. that’s basically the biggest problem i had. the characters weren’t the most unique? most were kind of your typical fantasy archetypes: you got your hero, your silly sidekick, and the super serious but kick-butt girl of the trio. pretty classic, at least.

i’d be curious to see where this series heads. it made me so nostalgic for middle grade 🥹

[Ms. Carpenter · Rating 3 out of 5]

As a 5th grade teacher who reads a lot of middle grade fiction, I found the pacing to be very slow, especially in the beginning. It took a long time for the story to really get moving, and I never felt that strong early hook that keeps younger readers eager to turn the page. The world building was detailed and clearly ambitious, but at times it felt like the setting was doing more work than the plot itself.

I also think the audiobook narration may have impacted my overall experience with the story. In my opinion, the narrator could have done a better job differentiating between characters vocally, and there were moments where the emotional tone of the narration didn’t quite match the dialogue or intensity of the scene. That sometimes made it harder for me to stay connected to the characters and the stakes of the story.

There were definitely elements I appreciated. The themes of belonging, identity, and standing up against oppressive systems are meaningful and fit well within middle grade literature. I also think readers who enjoy fantasy with heavy lore and slower, more immersive world-building may really enjoy this one. The alternate Roman-inspired setting felt unique compared to many other middle grade fantasy books currently out there.

In the end, I struggled to fully connect with Niil or feel emotionally invested in the stakes of the story. I kept waiting for the momentum to pick up, but it never quite reached the level I was hoping for.

[Curtis Mason · Rating 3 out of 5]

Quick caveat, I was unable to finish this audiobook. Continue reading if you want to understand if this book might be right for you.

The story itself seems interesting if a little slow and has a lead character that is in his early teens who eventually teams up with another early teenage female. The magic system almost has the feel of Venom (anything can be shaped with appropriate visualization) but without the parasitic nature. I feel that the story really started taking off at about 40% or so, but I was unable to continue due to the narration. I would have been able to finish an eBook or a print book.

I tried listening to this multiple times and could not get past halfway through before giving up because of the narration. The narrator has a very soft voice, and I imagine them speaking with lips only a centimeter or less from the microphone while trying not to wake a baby that is less than 10 feet away in the same room. I listen a lot while driving and the narration is so soft that I am listening at a very high volume. Then the narrator gets excited and speaks almost in a normal voice and I am deafened by the sudden change in volume.

If you have dedicated time to listen in a quiet environment with noise cancelling headphones and the premise sounds interesting from the second paragraph or from other reviews, I can recommend it. It did not work for my listening environment.

Writing 4:5
Narration 1/5
Overall 3/5

[Stephanie Tournas · Rating 3 out of 5]

Eleven year old Niil is kidnapped by debt collectors for the debts of his father and brought to Umbra. His captors are kind to him, but when they disappear, Niil must make his own way. He discovers enari, a valuable liquid metal that can be shaped into anything. He meets Ada and her cousin Soes and together they travel to Caput Mundi where enari is as much a weapon as currency. The three youngsters try to find the adults who have let them down, and, in so doing, discover a lot about themselves.

Set in a world based on ancient Rome, this story is a fast-paced adventure fantasy where the protagonist must learn the advantages and pitfalls of his newly discovered powers. There are new friends who may not actually be friends and much to discover in the capital Caput Mundi. At the end, Niil, Ada and Soes find out how someone they thought was an ally has diabolical plans to wreak a terrible revenge on the people of the Caput Mundi. The ending hints at further adventures. The author creates a world of haves, have-nots, with greed and power at the core. Kids who enjoy books about kids with special powers, in a quasi-historical magical setting may find themselves happily immersed in the world of Hearth. A nicely drawn map at the beginning helps to understand Niil’s travels. I’m not sure of racial distinctions of the characters.

[Kathleen · Rating 3 out of 5]

I received a free review copy of this book.
I found the setting interesting - it's a mix of a post-apocalyptic tainted wasteland and something like an ancient Roman-inspired utopia, a mix of high and low tech. As is typical in middle-grade fiction, the adult characters can't seem to get anything done, plotwise, although I felt like the children we're following also seemed to lack agency, or at least consistent motives. Take, for instance, their arrival at the mine in the second half of the book: They went there to look for someone. Upon arrival, they neither look around nor ask around to see if he's been there, nor do they leave upon NOT finding him! What was the actual plan? There are also some elements that come up multiple times, without any clear connection between their appearances, that are treated as if their mere presence in the scene necessarily ties it to every other time they've showed up. This either doesn't follow, or wasn't explained properly.
As to the sci-fi: the mental manipulation of liquid metal, or more probably nanoparticles, is certainly an idea worth exploring. I'm a little concerned about where in the body it's presumably stored - like, what is it displacing, especially in the kids, who are carrying around unusually large quantities of it? Interstitial fluid? If it's actually in the bloodstream, their blood pressure must be dangerously high.

[Sirah · Rating 3 out of 5]

Niil (pronounced like "Neal") is kidnapped from his father and finds himself on a desolate island that used to be a mining community. His kidnappers aren't bad people, but when they disappear, Niil is pulled into a dramatic conflict related to the strange metal that people can absorb into their bodies and then shape into any kind of tool they can clearly picture: Enarii.

I'm honestly surprised I didn't like this one better. I typically like adventure stories with lush worlds and well-crafted characters. But it has two strikes against it: first, the ending. Ug. Nothing is resolved at all, and the author just pops in a cheeky message about "there's always hope" as if that's supposed to make up for all the terror and disappointment earlier in the book? And then there's the narrator. Maybe I'd like this book better if I'd gotten a physical copy. But Laura Clifton's narration kept putting me to sleep. There were times I wanted to reach out and tell Laura that it was okay: she didn't have to sound so sad. But if you like a gentle deep feminine voice that takes everything very seriously, maybe you'll find reason to give this book more stars than I did.

Thank you to NetGalley and the publisher for this ARC. All opinions are my own.

[Laura · Rating 5 out of 5]

A young boy discovers he has a special ability as he searches for his parents in Kang's imaginative middle grade debut, CAPUT MUNDI: THE HEAD OF THE WORLD. When his father accrues a huge debt, 12-year-old Niil is kidnapped and held hostage by a couple named Marcus and Mira. The couple take Niil to their home on the island of Umbra, where Niil learns about enarii, a black liquid metal that can become anything. Niil later discovers that he is able to control enarii, an ability he's inherited from his mother, according to Marcus. When Marcus and Mira are later killed in a fire, their daughter Ada comes to Umbra in search of answers. Determined to find his missing parents, Niil convinces Ada to let him travel with her to the magical city of Caput Mundi.

Kang's imaginative debut is full of magic and adventure, with a good amount of twists and turns. The writing flows well and the book's short chapters and unique storyline are sure to draw in young fantasy fans. Moreover, readers will admire Niil's courageous journey to find himself and his place in the world. Fans of Avatar The Last Airbender will enjoy this heartfelt fantasy.

[Amanda · Rating 3 out of 5]

I received a free copy of this book from Library Thing.

The concept of enarii and world building are the stand outs to me in this book. Very interesting concept, and I could tell that was all well thought out. However, like another review mentioned, 12-year-olds are children. I had a hard time staying engaged as these kids went and literally got a job on their own. I know that does happen in the world, but it felt like the main characters in this book should have been older. The reasoning and very adult feelings they have at times just didn't sit well with the idea that these are children. I felt that Soes reacted the most realistically.

I did enjoy the book, despite having to re-read sections. I felt like it jumped around at times, or perhaps it was more trying to represent how a 12 year old would think, but for example: in some scenes characters aren't discussed again and we don't know what happened. They just show up again later. I thought I'd skipped reading a paragraph or something and re-read to see what I missed. I didn't.

I would recommend this to the middle schoolers in my life. I feel they would very much enjoy Niil's story.

[Jessica (Odd and Bookish) · Rating 4 out of 5]

I received a copy of this book for free for promotional purposes.

This was a great start to a new middle grade fantasy series!

The book is described as Percy Jackson meets Avatar: The Last Airbender. As a huge Avatar fan, that comparison has merit! The story focuses on a substance called enarii which is a black liquid (illustrated on the cover) that can become anything you can imagine. Wielding enarii was similar to the bending in Avatar.

The story was exciting and hooked me right from the start. It was full of adventure and there were some twists and turns that I was not expecting. The world building was fantastic as well. It was easy to understand the world and its system.

I didn’t want the story to end. I felt like the book could have been longer to more adequately explore all that was revealed. The story ended right when it was getting good. I didn’t expect everything to be resolved but I still wanted a little more.

The book also included a map which was helpful in following the characters’ journey.

Overall, this was a fantastic first book and I cannot wait to find out what happens next! If you enjoy middle grade fantasy adventure stories, be sure to check this one out.

[Kibet · Rating 5 out of 5]

Heartfelt and inventive

Kang delivers a powerful fantasy with an emotional core to match. It is deceiving at first glance, as it is not all about the young protagonists finding out about hidden abilities, living in a magical city and missing their parents. Instead, the author infuses a more hopeful tone that makes it difficult to put down. The story offers more than its adventure roots, as it inspires courage, identity and belonging to sacrifice even in the most hurtful conditions.
The Enarii plays a huge symbolic figure in the story as it operates within the wielder’s will. It adds a cultural and playful richness to the plot, and the author delves even deeper into themes like self discovery. Caput Mundi is portrayed as a lively city all through the story which makes it engaging and adds a creative spark to the fantasy.
Niil’s journey shows the importance of emotional clarity which is the primary anchor in the story. The difficult choices and truths faced all throughout are a testament of Niil’s character and whether he can compromise his values.

[Bobi · Rating 2 out of 5]

Thank you to the Books Forward and Library Thing for this ARC.

Great ideas, but the logic isn't logic-ing for me.

I love the idea of an element (or "eloment" as the author spells it) that can be shaped into any form by telekinesis. This element, enarii, comes to the protagonist, an eleven-year-old boy named Niil, who is kidnapped from his father. Strangely, the young child doesn't get upset about being kidnapped and bonds with the couple who took him. A year later, Niil is described in the following way: "He was 12 now--no longer a child." Excuse me? Since when are 12-year-olds not children? I am a middle school teacher and I work with 12-year-olds every day. They are definitely children.

There are more things that come about in the book that seriously confused me. I won't lay them all out here, but I will give the author credit for doing a good job with her descriptive language.

[David Carriere]

Caput Mundi, the Head of the World: Enarii is a dazzling adventure fantasy for upper middle-grade readers that blends action, mystery, and hopepunk sensibilities. B.R. Kang introduces Niil Terra, a young protagonist on a quest to find his missing parents, who discovers a world brimming with alchemic wonders and the shape shifting metal, enarii.

Kang’s narrative excels at combining thrilling adventure with profound themes of perseverance, self discovery, and standing up for what is right. Readers are immersed in a richly imagined world while rooting for Niil as he navigates complex choices, including confronting his own mother’s dangerous ambitions. This book balances high-stakes fantasy with heartfelt messages about belonging, courage, and the power of taking control of one’s destiny.