Great fantasy style book with characters that are wonderful like Niil 💛

Love the details and uniqueness of this story

Great world building and character interactions 😊

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!

Caput Mundi is a story about a 12 year old boy, who goes on an adventure to find his parents in Caput Mundi, the capital city. Here, the magical metal of Enarii is used for daily life, and he learns a lot more about Enarii and the political situation. Much of the conflict there involves a terrorist group that wants to attack Caput Mundi and the people who control Enarii and other important resources.

As far as a middle grade fantasy adventure, this is a fun and exciting tale that includes magic. There is a reasonable relationship with the other two kids, Ada and Soes. It is a story about doing the right thing, even when it is difficult.

Frankly, the beginning is super weird. Niil's mother has disappeared and left him with his father, and when Niil is kidnapped by a strangely kind couple, his father doesn't respond at all? When Niil's kidnappers disappear, Niil is compelled to find out what happened to them and look for his parents so he travels to Caput Mundi with Ada.

There are, at least, multiple cases where Niil shows he cares about other people, animals, and plants, so his reactions to events are logical and meaningful. The ending resolves some things but leaves others open ended for a sequel.

I can see how this book would appeal to a middle grade audience, but I feel it had some to be desired in terms of development.

I enjoyed how it drew from Ancient Roman mythology/stories to set up a world intertwined with magic, but at times this felt a bit too lazy of a trope. As far as characters went, they lacked a certain something to make them feel realistic; the three main characters all have different personalities, but they come across as unrealistic and exhausted, I believe we have already seen them in a multitude of formats and media before, we are in need of something new, less comedic at times.

The story seemed to change focus as the book progressed, which kept the reader gripped, but in the end left more questions than answers. There are aspects that I feel should have been developed more,<spoiler> such as the destruction caused by the mines, and the willingness to hire child labour,</spoiler> instead by just being part of what drives the pot along makes the book feel lacking in a landscape where authors are trying to be more mindful with the stories they tell.

3,5⭐

I love middle-grade books, even though I’m long past that stage of life. I think my passion for Disney helps me enjoy stories clearly made for children as much as serious tales for adults. And "Caput Mundi, the Head of the World: Enarii" was a lighthearted story that left me smiling by the end.

However, I have to point out that while the book starts very strong—the first chapter gets right to the point with Niil’s kidnapping without any fluff—the pacing wasn't entirely consistent, which slightly detracted from my experience. But one thing that definitely worked for me was Niil himself. He’s the kind of protagonist you just want to wrap in bubble wrap and protect, all while rooting for him to discover who he truly is and where he belongs in the world. He is sweet and determined, with a lovely tendency to look for the best in people—even when it would be far easier to simply give up on them.

I think that fits perfectly with the spirit of a middle-grade book. Although the story deals with themes like abandonment, injustice, greed, and social conflict, it never loses that sense of adventure and discovery I look for in this genre of fantasy.

I also really liked how the book handles the idea that not everything is simply "good versus evil." As Niil discovers more about the people around him, it becomes increasingly difficult to clearly distinguish between heroes and villains. There are characters who do questionable things for reasons we can understand, and others who seem to be on the right side until we realise things might not be quite that simple.

This made for some very interesting plot twists—and I have to admit, there were a few I really didn't see coming!

My favourite element of the world-building, however, was definitely the enarii. The concept of a liquid-metal-like substance that can be manipulated and transformed into practically anything—depending on the controller's skill—is really fun. I also enjoyed gradually discovering that enarii isn't just a tool or a magic system. It is deeply intertwined with the world's history, the inequality among its inhabitants, and the events that led to specific conflicts. It’s one of those concepts with the potential to become even more fascinating as the series progresses.

I really hope that happens, because I felt the world still had a lot to show. Although the world-building is interesting, I felt it could have been developed a bit more—especially since the very concept of Caput Mundi, with its references to the Roman Empire and the social structure underpinning that universe, really piqued my curiosity. I wanted to learn more about the setting and better understand how that society functions.

I felt the same way about some of the characters. Ada, Soes, Marcus, and Mira have interesting traits, but I didn't always feel we had enough time to truly get to know them. Ada, in particular, has a personality quite different from Niil’s, and I really enjoyed the dynamic between them, though I would have liked to see more development in their relationship.

Despite these issues, I really enjoyed the sense of adventure the book offers. There is something truly delightful about following Niil as he discovers a brand-new world, makes new friends, and gradually realises there is far more going on around him than he had imagined. And I think that is precisely the greatest strength of "Caput Mundi, the Head of the World: Enarii": it manages to be an accessible fantasy without treating young readers as if they aren't capable of handling complex themes.

Ultimately, I was left with the feeling that this is just the beginning of something that could grow into something much bigger. After all, this is the first book in a five-part series (I believe it’s five—I read that somewhere, though I can't recall where), so there is plenty of room for the world to expand, the characters to mature, and the questions raised by the first book to be answered. For me, "Caput Mundi" was a fun, creative read full of potential. I definitely recommend it to anyone who enjoys middle-grade fantasy, adventures in new worlds, and creative magic systems. I’m eager to see what comes next!

Thanks to NetGalley for the ARC in exchange for an honest review!

DNF'd at 10%. The book starts off very quickly and unexpected, which ups the anticipation. The premise seems intriguing, but the writing and plotting is lackluster. I can see readers who appreciate slower-paced fantasy books really appreciating this read.