The Mac Undercover (Mac B., Kid Spy #1)

The Mac Undercover (Mac B., Kid Spy #1)
Author(s)
Publisher
Age Range
6+
Release Date
September 11, 2018
ISBN
978-1338143591
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James Bond meets Diary of a Wimpy Kid with this groundbreaking fully-illustrated chapter book series Mac B., Kid Spy. The precious Crown Jewels have been stolen, and there's only one person who can help the Queen of England: her newest secret agent, Mac B. Mac travels around the globe in search of the stolen treasure...but will he find it in time? From secret identities to Karate hijinks, this fast-paced, witty and historically inspired chapter book will keep readers guessing until the very last page. With full-color illustrations and fascinating historical facts masterfully sprinkled throughout, this series offers adventure, intrigue, absurdity, history and humor. Discover this totally smart and side-splittingly funny new series, and experience what it's really like to be a kid spy.

James Bond meets Diary of a Wimpy Kid with this groundbreaking fully-illustrated chapter book series Mac B., Kid Spy. The precious Crown Jewels have been stolen, and there's only one person who can help the Queen of England: her newest secret agent, Mac B. Mac travels around the globe in search of the stolen treasure...but will he find it in time?

From secret identities to Karate hijinks, this fast-paced, witty and historically inspired chapter book will keep readers guessing until the very last page. With full-color illustrations and fascinating historical facts masterfully sprinkled throughout, this series offers adventure, intrigue, absurdity, history and humor. Discover this totally smart and side-splittingly funny new series, and experience what it's really like to be a kid spy.

Editor reviews

2 reviews
Fun Notebook Novel Spy Romp
(Updated: June 03, 2026)
Overall rating
 
5.0
Plot
 
5.0
Characters
 
N/A
Writing Style
 
N/A
Illustrations/Photos (if applicable)
 
5.0
In this notebook novel, author Barnett explains to his readers what he did before he became a children's author. Because Mac is one of the better kids in his class, he gets a phone call from the Queen of England asking him to drop everything, come to England, and solve a mystery for her. She'll even write him a note for his parents and school. He visits the queen, and she tells him that a very important spoon with a lot of history was stolen from her, probably by the president of France after she got irritated and stuck her tongue out at him. She didn't realize he was looking! Even though Mac is unimpressed with British biscuits, he does enjoy the queen's dogs, so takes off for France with one of the corgis, Freddie. There is more to this mystery than meets the eye, and given the 1980s setting, it's highly likely that the USSR and the KGB will play a part in this fun spy mystery that also shows the grave importance of having a pair of perfectly faded blue jeans!
Good Points
This author came to my attention with his Terrible Two series, as well as the Brixton Brothers books, and he definitely has embraced his inner ten-year-old in a very successful way! I love the author's note that explains that he was a conselor in a camp, and told these stories to his campers! It's goofy fun that asks us just to suspend our disbelief. It is an extremely well formatted book, with a good mix of pictures and a good size of font. This will be a big hit with emergent readers as well as struggling middle school ones who only want "books with pictures". I appreciated that it was clever enough for me to find amusing as well.

Children will suspend their disbelief this easily, because what middle school students COULDN'T be a spy? Of course, they probably will have a harder time believing that Mac can trade things for the blue jeans than believing that he is working for the queen. Few of my students wear anything but track pants to school!

I could really go for a custard cream (biscuit) right now, or even a McVitie's wholemeal digestive, even though they DON'T have chocolate chips! (Or a Cadbury Milk Chocolate Finger!) Readers who gobble up books like Timmy Failure, Tom Gates, Big Nate or Steve Moore's King of the Bench series will find this to be a tasty addition to their Book Biscuit Tin!
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User reviews

1 review
Overall rating
 
4.8
Plot
 
5.0(1)
Characters
 
5.0(1)
Writing Style
 
4.0(1)
Illustrations/Photos (if applicable)
 
5.0(1)
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A Funny and Fast-Paced Spy Adventure for Kids
(Updated: June 03, 2026)
Overall rating
 
4.8
Plot
 
5.0
Characters
 
5.0
Writing Style
 
4.0
Illustrations/Photos (if applicable)
 
5.0
I found this book to be really fun and energetic, kind of like a mix between a spy movie and a goofy school diary. It does not take itself too seriously, which actually makes it even more enjoyable. From the very beginning, it throws you into a wild mission involving stolen Crown Jewels and a kid who somehow ends up working for the Queen of England.

Mac B. is a really entertaining main character because he feels like an ordinary kid who suddenly gets pulled into something way bigger than himself. He travels around, tries to solve the mystery, and keeps running into ridiculous situations that make the story feel unpredictable and funny at the same time. The humor is very light and playful, and the illustrations add a lot to that tone.

One thing I really liked is how the book mixes in real historical facts with the story. It sneaks in little pieces of information while still keeping everything silly and fast-moving. That balance between learning something and being entertained makes it stand out from a lot of other chapter books.

The illustrations are also a big part of what makes it enjoyable. They are colorful, expressive, and help break up the text so it never feels too heavy. It really does feel like a hybrid between a graphic novel and a traditional chapter book, which makes it very accessible for younger readers.

I also liked how the pacing keeps you engaged the whole time. There is always something happening, whether it is a chase, a strange disguise, or a misunderstanding that makes everything more complicated. It is the kind of book you can read quickly because you always want to know what happens next.

Overall, I found The Mac Undercover to be a really fun start to a series that mixes adventure and spy action in a way that works really well for kids.

It is part of the larger Mac B., Kid Spy series, so readers who enjoy this first book will have more adventures to continue with.
Good Points
Funny, fast-moving spy adventure that keeps readers engaged

Clever mix of humor, illustrations, and real historical facts

Easy-to-read format that works well for younger or reluctant readers
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