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Publisher Description

Now a Nickelodeon Original Movie!
Over 100 Weeks on the New York Times Bestseller List!
44 State Award Lists!
Discover what James Patterson calls “the coolest library in all the world” in this fun-filled, action-packed bestseller from the much-loved co-author of I Funny and Treasure Hunters!
“A worthy successor to.…Willy Wonka.” —Booklist, Starred Review

When Kyle learns that the world's most famous game maker, Luigi Lemoncello, has designed the town's new library and is having an invitation-only lock-in on opening night, he's determined to be there! But the tricky part isn't getting into the library—it's getting out. Because when morning comes, the doors stay locked. Kyle and the other kids must solve every clue and figure out every secret puzzle to find the hidden escape route! 

Don't miss bonus content in the back of the book—extra puzzles, an author Q&A, and more! And look for the puzzle-packed sequels—Mr. Lemoncello's Library Olympics and Mr. Lemoncello’s Great Library Race!

“Full of puzzles to think about, puns to groan at …this solid, tightly plotted read is a winner for readers and game-players alike.” —Kirkus Reviews, Starred Review

Young Adult
June 25
Random House Children's Books
Penguin Random House LLC

Customer Reviews

PeytonUpty ,

This book, taught me to love reading

I not much of a reader, since after all I have dyslexia...but when my friend told me to try and read it, I did some research, read some reviews and I thought it sounded interesting so I downloaded it on my kindle fire and I was intrigued how creative and thoughtful the book was, and I wanted to read every book in the series, right then and there! Now this book opened up so many opportunities for me and it’s the reason why I even bother reading, because if it wouldn’t thanks to this book I would still hate reading and would of never read any other books in my free time. I highly suggest reading this book if you’re into fiction and adventure stories, and the way the words describe the each sentence is breathe taking. I love even chapter, every page, every sentence, and every word written in this book.

A Apple device user ,


Nothing fun happens and the in book puzzles are impossible to do

Aves$ 😋 ,


So much happens I could ready a thousand times! Best book!

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