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  • The Underwearwolf

The Underwearwolf

Author
Illustrator
Charles Santoso
Publication Date
May 12, 2026
Genre / Grade Band
Fiction /  K − 1st
Language
English
Format
Picture Book
Includes Back Matter
Interactive
The Underwearwolf

Description

A kid finds himself in a hairy situation when he dons a pair of not-so-normal undies under the light of the full moon in this wolfish picture book romp.

Do not, under any circumstances, or for any reason, wear this underwear under the full moon. Do you understand? Get ready to howl with laughter as one rule-breaking, underwear-loving kid transforms into a—gasp!—UNDERWEARWOLF!

Now he's on an unforgettable nighttime adventure that may or may not include furry paws, sharp claws, uncomfortable wedgies, and an honest-to-goodness wild wolfpack! No butts about it—this is one read-aloud that'll blow your undies off!

Publication date
May 12, 2026
Genre
Fiction
Page Count
32
ISBN-13
9781665955584
Publisher
Simon & Schuster Books for Young Readers
BISAC categories
JUV019000 - Juvenile Fiction | Humorous Stories
JUV048000 - Juvenile Fiction | Clothing & Dress
JUV079000 - Juvenile Fiction | Werewolves & Shifters
Library of Congress categories
Humorous stories
Picture books
Werewolves
Humorous fiction
Underwear

Publishers Weekly

Sterer (If You Make a Call on a Banana Phone) and Santoso (Evelyn Witch Gets a Pet) mash the monstrous and the truly mundane in this gleeful picture book outing. When the pale-skinned narrator's uncle Larry sends a pair of unusually fuzzy underwear as a gift, the protagonist disregards the fine print warning against wearing them during a full moon ("didn't look too full to me," the child says, shown glancing at the circular, glowing orb). Digitally created spreads employ furry textures and eerie lighting, evoking classic horror film vibes as the child dons the unders, then sprouts canine features, becomes "HAIRIER THAN A HUNDRED HAMSTERS," and runs wild through the streets. The kid considers losing the drawers, but the risk of being caught "butt naked"--in the road, on a chimney--proves both deterrent and running gag. After the character meets up with a real (if slightly confused) wolf pack, they gather together on a moonlit peak for a collective "AWOOOOOOO!" before sunrise breaks the spell. Quippy and freewheeling, it's every kid's fantasy of living fancy-free--no bedtime, no rules, almost no pants--and living to howl about it. Ages 4-8. Author's agent: Stephen Barr, Writers House. Illustrator's agent: Tamara Shannon, Shannon Assoc. (May)

Copyright 2026 Publishers Weekly, LLC Used with permission.

Kirkus Reviews

Starred Review

Best read beneath a gibbous moon to truly make your intended audience howl...with laughter.

Gideon Sterer
Gideon Sterer is a New York Times bestselling author who grew up in the woods of upstate New York. Not too far away, his parents owned a wildlife discovery center where he would run around after hours and let the animals out. His books include If You Make a Call on a Banana Phone, The Midnight Fair, I Will Read to You, and Treehouse Town.


Gideon Sterer es un autor superventas del New York Times que creció en los bosques del norte de Nueva York. No muy lejos de allí, sus padres eran dueños de un centro de descubrimiento de vida silvestre donde él corría después de horas y dejaba salir a los animales. Sus libros incluyen If You Make a Call on a Banana Phone, The Midnight Fair, I Will Read to You y Treehouse Town.
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