The Definitive Guide to

Warning: Do Not Open This Book!

Written by Adam Lehrhaupt & illustrated by Matthew Forsythe
Published by Simon & Schuster
6.08 / 7.0
- Bookroo Rating
Goodreads Rating - 3.9 / 5.0
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Prices as of Apr 12
Retail Price
used $0.80
Aug 27, 2013
Publication Date
Target Age

What Does Bookroo Think of This Book

“An intriguing and playful interactive story just begging to be opened.”

With a title like Warning: Do Not Open This Book!, any reader’s curiosity will be piqued, and this story counts on its well-intentioned instructions to be ignored by mischievous readers curious as to why they have counterintuitively been forbidden to open a book. The book develops incredibly well. The playfulness begins building at the opening endpapers, which contain warnings like “This book is super dangerous,” and “I guess you don’t mind being mauled by monkeys,” with half the word “monkeys” having been bitten off the sign. From there readers encounter a single warning sign that shows the face of a monkey with the word “Danger” written above it. The text on the page ominously warns “You don’t want to let the monkeys out.” As pages are of course flipped the first monkey appears innocently enough, poking its harmless head out from the side of the page. Chaos builds on the following pages as monkeys, toucans, and an alligator are all added to the mix. Forsythe’s illustrations match Lehrhaupt’s playful tone, and the introduction of the alligator is particularly well done as only half of its mouth appears from the side of the page, with “monkeys” written in the middle of the alligator’s gaping mouth. “That didn’t sound like . . . monkeys. . . . “ reads the text. Other pages also include fun interplay of the text and illustrations as the monkeys disrupt the normal layout of the text. The book design is best for a certain age range, probably between 3 and 4, when young readers want to follow the book’s pleadings for laying and executing the suggested plan; after a certain age, kids will just start to disrupt the narrative themselves and, for example, yell when they’re told to be quiet so as not to alert the characters to the plan.

What's This Book About

Publisher Summary

CAUTION! This book contains monkeys, toucans, and a whole lot of silliness.You really shouldn’t be opening this book.

I’m serious.

Just put it back on the shelf.


You’re still reading this?

Well, don’t say I didn’t warn you…

It looks like a book, it feels like a book, and it even smells like a book. But watch out…madness and mayhem lie within! Debut author Adam Lehrhaupt urges you NOT to take a walk on the wild side in this humorous, interactive romp with inventive and engaging illustrations from Eisner Award-winning comic artist and rising star children’s book illustrator Matthew Forsythe.

This quirky, subversive creation begs to be enjoyed again and again and again.

What Kind of Book is Warning: Do Not Open This Book!

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Trusted Reviews & Ratings

Mom of Boys
Mom of three little boys who love books about dragons, whangdoodles and magic.
6.5 / 7.0
Lemony Snickers
Reading contracts all day long. Not bad, but not quite as fun as reading about hobbits.
7.0 / 7.0
Readerly Mom
Bay Area mother of two, world traveler, book lover, picky reader
4.75 / 7.0

It’s fun! I like interactive books like this–this one isn’t super original, but my preschooler and toddler still really enjoyed it.

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Who Wrote Warning: Do Not Open This Book!

Adam Lehrhaupt

Adam Lehrhaupt is an award-winning author who has traveled to six continents, performed on Broadway, and lived on a communal farm. Adam currently lives near Philadelphia with his wife, sons, and two crazy dogs. Visit him at

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Who Illustrated Warning: Do Not Open This Book!

Matthew Forsythe

Matthew Forsythe is an award-winning artist and illustrator. He has worked with the New York Times, the Wall Street Journal, Cartoon Network, DreamWorks, and Nickelodeon. He lives in Port Colborne, Ontario.

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What Has Adam Lehrhaupt Said About This Book

Nothing yet! 🤷 You should let Adam know that you want more details about Warning: Do Not Open This Book!! Try tweeting Adam on twitter (@Lehrhaupt) or messaging Adam on instagram (@lehrhaupt).

What Has Matthew Forsythe Said About This Book

Nothing yet! 🤷 You should let Matthew know that you want more details about Warning: Do Not Open This Book!!

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Book Details

Publication Date:
August 27, 2013
Library of Congress Number (LCCN):
Lexile® Level:

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Core Score - 62%
More than halfway there—keep going!
Depth Score - 25%
Just the barebones.
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