Blog Tour / Book Review

The Mostly Invisible Boy by AJ Vanderhorst | Blog Tour + Book Review

The Mostly Invisible Boy
Author: AJ Vanderhorst
Genre: Middle-Grade Fantasy
Pages: 298
Publication Date: May 27th 2021

Buy the Book: Amazon

Hello hello! I hope everyone is doing well. Can you believe we are half way through 2021 already. Where does the time go! Today is my stop on The Write Reads blog tour for The Mostly Invisible Boy and I have to say, I just thought this was such a cute, fun and magical story to read.

Thank you The Write Reads and the author for an ecopy of the book in exchange for an honest review!


Eleven-year-old Casey is stubbornly friendly, but he’s eternally the new kid at Vintage Woods Middle School. Students look right through him—and they’re not faking. Casey doesn’t know why he’s mostly invisible, but when he scales a colossal oak, he discovers a fortress in its branches. The forgotten sentry tree marks the border between his safe, suburban life and a fierce frontier.

Casey and his little sister Gloria infiltrate Sylvan Woods, a secret forest society devoted to ancient, wild things. Sky-high footpaths. Survival sewing. Monster control. Shockingly, people here actually see Casey—but being seen isn’t enough. He wants to belong.

Keeping his identity hidden–while struggling to prove he fits–is hard enough, but Butcher Beasts have returned to Sylvan Woods after a hundred years. Trickery is under siege. As the monsters close in, and the fearsome Sylvan Watch hunts Casey down, he and his newfound friends must unearth abandoned magic, buried at the forest’s roots…or be devoured along with everyone else, Sylvans and civilians alike.

A fast-paced middle-grade fantasy/adventure book with all the monsters kids could ever hope for.

My Review

I loved this book as soon as I started reading it. I found it incredibly hard to put down as I got so attached to the characters and immersed in the magical, monster-filled world. As I’m a big tree climber myself, well not anymore, I don’t exactly have any time to climb trees right now, I really connected with the characters in this way and just the whole book in general. My mum always used to say if I’m not responding to her messages it’s probably because I am up a tree somewhere.

The adventure these characters go on is incredible and I wish I was right alongside them, battling the creepy monsters, exploring the new world and getting to know all the secrets of Sylvan forest. The amount of imagination that has gone into this book is just amazing. It’s so easy to visualise and get attached to this world the author has created.

I love the bond between the main character, Casey and his sister Gloria. The way they care for each other just made me smile at times. Their journey is so fun to follow but I must say, there are some bits that aren’t explained or make the most sense. However, this isn’t an issue, with the book being so fast-paced and addicting, it’s easy to get sucked back into the story again.

Overall, The Mostly Invisible Boy is a great middle-grade fantasy that is perfect for anyone wanting a fun and immersive book full of action, adventure and the work of pure imagination. This book is such a delight for all ages. I am so glad I read it and I’m sure you will too!

Rating: 4.5/5

Rating: 4.5 out of 5.

About the Author

AJ Vanderhorst has had many jobs, including a journalist, paramedic, escape artist, and baby whisperer. One time in fifth grade, he built a traffic-stopping fort in a huge oak tree, using only branches and imagination, and slept there for a week.

Now he and his wife live in a woodsy house with their proteges and a ridiculous number of pets, including a turtle with a taste for human toes. This makes AJ an expert on wild, dangerous things—invisibility spells, butcher beasts, hungry kids, you get the idea.

He is the only author in the world who enjoys pickup basketball and enormous bonfires, preferably not at the same time. He and his family have drawn up several blueprints for their future tree castle. Visit AJ online at

Goodreads | Twitter | Amazon

If you liked this, read my review for Amari and the Night Brothers by B.B. Alston here!

Manchester blogger with a passion for reading, writing and travelling. I always have a book or a cup of tea in my hand.


21 June 2021 at 7:34 pm

The sibling bond was my favorite part!

23 June 2021 at 7:06 pm

Fantastic review Ellie Mai, I’m so glad you enjoyed it, I did too, it was so fun and I loved Casey and Gloria’s relationship!

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