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

"It is Princess Harriet Hamsterbone to the rescue when Heady the hydra's egg is stolen, but her search leads her to a castle accessible only by a rat with a very long tail"--

"Humphrey helps the students of Room 26 find a missing dog"--

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.

When Harry, the class pet, gets out while at Amelia Bedelia's school break, Amelia and her friends must find him.

When the Willows move into a new house, Celia, the youngest of four children, traps an enchanted hamster, who reluctantly agrees to grant the children one wish in exchange for his freedom.

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.

Sweetie Pie escapes the confines of her hamster cage--and a series of insufferable owners--to find a new home in the wild.

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.

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.