Under Their Skin
Margaret Peterson Haddix
Both books explore Juvenile Fiction
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A puzzle-packed library adventure that turns book knowledge, teamwork, and the Dewey Decimal System into the ingredients of a genuinely fun middle-grade game.
Kyle Keeley is a twelve-year-old who loves games far more than homework, so when the eccentric game designer Luigi Lemoncello builds a dazzling new public library in Kyle's Ohio town and invites a small group of kids to an overnight lock-in, Kyle is determined to win a spot. The real contest starts the next morning, when the kids learn the doors will stay shut until they find a hidden way out using only what the library holds.
The book reads like a cross between a Willy Wonka factory tour and an escape room. Grabenstein fills the pages with rebuses, riddles, codes, and references to classic children's books, and he invites readers to try solving along with the characters. The players split into rival teams, and the story turns on a simple but useful contrast: kids who cooperate and share ideas versus kids who will cut corners to win.
The pace is quick, the chapters are short, and the humor leans on puns and slapstick that young readers tend to love. It works well as a read-aloud for a family or classroom, since adults and kids can puzzle over clues together. Underneath the gadgets and holograms, it is a cheerful love letter to libraries, librarians, and the idea that reading widely makes you a better problem solver.
Grabenstein imagines a library packed with interactive displays, secret rooms, and clues tied to real books and catalog numbers. The setting does double duty: it drives the plot and quietly shows young readers how libraries are organized, making research skills feel like secret weapons rather than chores assigned by a teacher.
Kyle's growth comes from learning to rely on friends whose strengths differ from his: a dedicated reader, a library expert, a sharp-minded strategist. The story sets their collaborative approach against a rival who schemes and cheats, making a clear but not heavy-handed case that sharing knowledge and playing fair pay off.
Many clues are presented so readers can work them out before the characters do. This makes the book unusually interactive, especially for reluctant readers who enjoy games. Bonus puzzles at the back extend the fun, and some readers return to the story to spot hints they missed the first time.
The novel is full of nods to well-known titles and authors, from fantasy staples to beloved picture books. These references reward kids who already read a lot and act as a reading list for those who don't, nudging curious readers toward the shelves once the story ends.
The characters are mostly sketched in quick strokes, and the main rival is a fairly cartoonish bully rather than a nuanced antagonist. Some puzzles are too easy for adults or older kids, while a few rely on references younger readers won't catch. The lessons about teamwork and honesty are stated plainly, which suits the target age but can feel obvious. Readers looking for a mystery with real danger or surprise depth will find this lighter and more playful, closer to a game than a thriller.
Book details and cover from Google Books.
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Margaret Peterson Haddix
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