Second-graders Arlene and Ilene Kelly are twins, identical twins to be exact, and they love being a pair. They love to dress alike, they have identical pet ferrets, and they do everything together. But being a twin is not always easy. And when Arlene gets sick and has to visit the hospital, the twins each find out what it's like to be one instead of two. But whether they're together or apart, Arlene and Ilene know they're lucky to have each other....

Describes the further adventures of an inquisitive seven-year-old and her neighbors in a New York City apartment building.

During the summer between first and second grades, Elisa struggles to write to her brother Russell at camp and then enjoys a family vacation in the country.

Julio and other students at Edison-Armstrong Elementary School organize to prevent the closing of their school.

Eating magical food to transform in cats enables fourth-grader Chaya Ann Tober and her brother Danny to go on nighttime adventures where they prowl their neighborhood, prevent a tragic cat-astrophe, and see each other in a completely new light.

Ten-year-old Ezra tries to convince his scholarly father that his baseball fever is not wasting his mind.

The adventures of five-year-old Elisa as she attends her brother's recital, gets new eyeglasses, moves with her family to a new apartment, and welcomes the new baby.

When his owner's parents let him go in Central Park, a young guinea pig learns to survive in the natural world with the help of a "park-wise" squirrel while trying to find his way back home.

Five-year-old Elisa has an older brother and a new baby brother, but her elderly neighbor says the middle is the best, just like the filling in a sandwich.

When he and his family move to the suburbs, Aldo has difficulty finding new friends.