Humphrey, a pet hamster at Longfellow School, learns that he has an important role to play in helping his classmates and teacher.

Humphrey the classroom hamster has adventures going to the library, learning about the ocean, and sailing across a pond on a sailboat.

When Humphrey the hamster returns to Mrs. Brisbane's class after the winter break, a new class pet and some other surprises give him an opportunity to reflect on the meaning of friendship.

"The holidays are coming and Humphrey is unsqueakably excited. He loves to hear about all the different ways his friends in Room 26 celebrate and to watch them make costumes and learn songs for the Winter Wonderland pageant. (He even squeaks along!) But with so much to do, will the holidays go according to plan? Do-It-Now-Daniel is having trouble practicing, Helpful-Holly can't stop worrying about making presents for her friends, and Humphrey still...

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.

Humphrey, the pet hamster of Longfellow School's Room 26, relates the ups and downs experienced by his human classmates as they begin a project to create a model town complete with houses and community services.

After learning about Sherlock Holmes, Humphrey the classroom hamster follows clues to try and discover why Mrs. Brisbane is gone and Mr. E, a fun but not very educational substitute, is taking her place in Room 26 at Longfellow School.

"Humphrey is spending the weekend at Garth's house when the prize for his scavenger hunt is stolen from its hiding place in Humphrey's cage."--

Humphrey, the pet hamster of Classroom 26, is helping Richie with a science project, but Richie's feisty puppy gets in the way.

When a dog gets too close to Humphrey at the town pet show, Og the Frog saves the day and Humphrey sees that having a great friend is the best prize he could possibly win.