The Underwearwolf by Sterer, Gideon

Perfect for fans of Creepy Pair of Underwear, this wolfish picture book romp follows a kid who finds himself in a hairy situation when he dons a pair of not-so-normal undies under the light of the full moon.

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!

Author: Gideon Sterer
Publisher: Simon & Schuster Books for Young Readers
Published: 05/12/2026
Pages: 32
Binding Type: Hardcover
Weight: 1.00lbs
Size: 9.20h x 11.30w x 0.40d
ISBN: 9781665955584
Audience: Ages 4-8

Review Citation(s):
Publishers Weekly 03/09/2026
Kirkus Reviews 04/01/2026

About the Author
Gideon Sterer is the New York Times bestselling author of The Christmas Owl, I Will Read to You, From Ed's to Ned's, Not Your Nest!, The Night Knights, and The Midnight Fair, among others. Gideon grew up in upstate New York, where his parents owned a little zoo in which he would run around after hours and let the animals out. He now lives in the Hudson Valley and invites you to visit him online at GideonSterer.com and on X.

Charles Santoso loves drawing little things in his little journal. He gathers inspiration from his childhood memories and curiosities he discovers in his everyday travels. He has illustrated several picture books, including The Snurtch, I Don't Like Koala, Finding Muchness, and Ida, Always. Charles also works as a visual development artist, creating illustrations for feature film projects. He lives and works in Singapore. You can visit him at CharlesSantoso.com.