Harriet’s ambition to know and see everything may change reclusive Agatha K. Plumber’s life for the...

Harriet’s new coat is perfect for her—and Marion Hawthorne, apparently. But who will win the school’...

Janie and Harriet vow never to go to dancing school, but Harriet doesn’t know that Janie actually li...

After an awful day, Harriet wants some alone time. Watching Mr. Withers’ 26 cats is just what she ne...

Harriet learns about her middle initial and questions who she is. Her nanny, Ole Golly, teaches Harr...

Janie and Harriet get to meet their favorite singer, only to discover a shocking truth about his mus...

Harriet really wants to win a photo competition, but it means teaming up with someone she doesn’t se...

Sport and Harriet think it’s time to get rid of their beloved stuffies, but change their minds—and t...

Harriet adds the Garcia family to her spy route…and discovers that someone is spying on her.

On her birthday, Ole Golly revisits a list of everything she wanted to do by the age of 35—and Harri...

When Harriet loses her last—and favorite—baby tooth, she struggles with saying goodbye to her babyho...

The Welsch family attends a neighborhood party where Harriet is determined to find out why the Robin...

At the world’s fair, Harriet meets a 14-year-old photographer who’s unsure of his future—but shows H...

Sport joins Harriet for a local scavenger hunt. But when he brings his good-luck charm to improve th...

While Harriet’s parents are out, she and Ole Golly join Mr. Waldenstein for a movie date. But can th...

When Ole Golly announces she and Mr. Waldenstein are getting married and moving to Montreal, Harriet...

Harriet’s dream of creating a post–Ole Golly life is shattered when her notebook falls into the hand...

The fallout from her private thoughts becoming public leaves Harriet fighting to repair her friendsh...

With the notebook causing quite a stir, Harriet hopes a backyard trial of her peers will prove her i...

After Harriet makes an unexpected discovery, she comes up with a plan to right her wrongs.