When summer arrives, Humphrey, the pet hamster of Longfellow School's Room 26, is surprised and pleased to learn that he will be going to Camp Happy Hollow.

Humphrey the hamster and the students in Mrs. Brisbane's class get ready for the holidays and a special Winter Wonderland program.

Humphrey the hamster is puzzled when unfamiliar students fill Mrs. Brisbane's classroom at summer's end, but he soon learns that his friends from last year are fine and that the new class needs his special help.

When three little hamsters are tired of being called cute, they work on disguises to become bigger and scarier.

While continuing to help his classmates solve their problems, Humphrey, pet hamster of Longfellow School's Room 26, faces many surprises, like rolling in a hamster ball, a substitute janitor who might be an alien, and the possibility of Mrs. Brisbane retiring.

"It's going to be a busy day for Stanley! He gets up early to sort through all of the mail in his post office. Then he sets off through town to deliver it all. Myrtle, Little Woo, and Charlie all receive exciting gifts and letters. But will everyone be happy with what's in Stanley's mail bag?"--

"During a creative writing unit at Longfellow School, the students in Mrs. Brisbane's class practice using their imagination with their very own writing journals--and Humphrey finds out that writing from his imagination is harder than it looks"--

"Stanley is working at his garage today. From filling up Hattie's red sport car with gas to changing the tire on Shamus' and Little Woo's blue car, it sure is a busy day. As his friends each come in with their car problems, Stanley knows just what to do to get them back on the road"--Provided by publisher.

"Og the Frog tells the story of how he first came to Room 26, where he meets Humphrey the hamster, befriends the students, and writes poems and songs"--