
Based on your book
by Barnett, Mac
Mac B. is just a kid, but he happens to be an agent for the Queen of England. When a priceless diamond goes missing, Mac is whisked away on a global mission that feels less like a polished thriller and more like a hilarious, high-stakes game of telephone. The book plays with the idea of memory and storytelling, as an adult Mac recounts his childhood exploits to his skeptical audience. It is fast-paced, irreverent, and packed with illustrations that keep the momentum high. If you enjoy unreliable narrators, deadpan humor, and the absurdity of a child trying to act like a seasoned secret agent, this will be right up your alley. It is perfect for younger readers who want a mystery that prioritizes wit and charm over grit, and who appreciate a protagonist who takes himself a little too seriously.
If you finished Mac Undercover and found yourself wishing for more, these picks were curated to satisfy that specific itch for clever, kid-led espionage. We looked for stories that balance the fish-out-of-water trope with sharp, witty dialogue and high-stakes puzzles. Whether you want the investigative rigor of a junior FBI recruit, the puzzle-solving intensity of a secret society, or just more of that distinct, fast-paced humor, these books capture the same spirit of adventure. They are all about kids who see the world differently and aren't afraid to step up when things get weird.
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Much like Mac B., Timmy Failure features a hilariously confident, slightly delusional young detective whose misadventures are driven by his own unique worldview. Both books rely on deadpan humor, absurd situations, and a distinct narrative voice that keeps young readers laughing while solving 'mysteries'.
Fans of Mac's international espionage antics will appreciate the high-stakes, puzzle-filled world of the Benedict Society. While slightly more complex, both series feature brilliant children taking on secret missions to save the world with wit and cleverness.
by Stuart Gibbs
This book is a perfect step up for readers who enjoyed the spy elements of Mac Undercover but want a slightly more grounded academy setting. It balances genuine spy craft with laugh-out-loud humor and the classic 'fish out of water' trope.
If you loved the absurd, illustrated, and fast-paced nature of Mac Barnett's writing, this series is a must-read. It shares the same playful, imaginative energy and the feeling that anything can happen on the next page.

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This book captures the same sense of playful wonder and puzzle-solving excitement found in Mac's adventures. Readers who enjoy watching clever kids navigate complex, game-like scenarios will find this incredibly satisfying.
by Stuart Gibbs
For readers ready for a slightly older protagonist but still craving the globetrotting, secret-agent vibe of Mac Undercover, this is an excellent choice. It features a brilliant young genius on a high-stakes mission that feels like a classic spy caper.
This modern, gender-swapped take on Sherlock Holmes offers a brilliant young detective solving crimes in her neighborhood. It shares the same episodic mystery structure and the dynamic between a genius detective and a more grounded sidekick.
While it leans more into the magical, this story shares the 'secret mission' structure and the feeling of a young protagonist thrust into a hidden, dangerous world. It captures that same sense of adventure and responsibility that Mac feels as a kid spy.
by James Ponti
This series features a young boy recruited by the FBI to solve crimes, making it a natural progression for fans of Mac B. It balances the 'kid spy' fantasy with real-world investigative techniques and plenty of humor.
For readers who loved the lighthearted, episodic, and illustrated nature of the Mac B. books, the Stink series offers similar charm. It focuses on the everyday, yet high-stakes, perspective of a young boy navigating his world with humor.

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As an Amazon Associate, we earn from qualifying purchases.
As an Amazon Associate, we earn from qualifying purchases.