After celebrating their first nine same-day birthdays together, Amanda and Leo, having fallen out on their tenth and not speaking to each other for the last year, prepare to celebrate their eleventh birthday separately but peculiar things begin to happen as the day of their birthday begins to repeat itself over and over again.

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.

Entering seventh grade at Walden Middle School, four girls continue their mother-daughter book club, reading Lucy Maud Montgomery's "Anne of Green Gables," while dealing with a mean, troublemaking classmate.

Four girls continue their mother-daughter book club, reading Charles Dickens's "A Christmas Carol," but from unexpected blizzards to a sledding disaster, nothing goes as planned.

Sixth-grader Annabelle spends autumn coping with competing groups of friends at school, her mother's pre-wedding stress, learning to get along with a cute stepbrother-to-be, and such momentous events as wearing her first bra and learning to shave her legs.

Twelve-year-olds Madeleine, Theo, and Lulu, and thirteen-year-old Garrison, are sent to a remote Massachusetts school to overcome their phobias, but tragedy strikes and the quartet must work together--with no adult assistance--to face their fears.

When Jack Frost's goblins steal Juliet the Valentine fairy's magical treats, causing people to fight with their friends and families, Rachel and Kirsty try to put aside their own fight and work together to get the treats back.

With her parents on the verge of separating, a devastated twelve-year-old Japanese American girl spends the summer in Los Angeles with her grandparents, where she folds paper cranes into wedding displays, becomes involved with a young skateboarder, and learns how complicated relationships can be.

When second-grader Alvin Ho is invited to a birthday party given by a girl, his fear of everything causes him to dread going.

Seventh-grader Emma-Jean Lazarus uses her logical, scientific mind to navigate the mysteries of the upcoming Spring Fling, her friend Colleen's secret admirer, and other love-related dilemmas.