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

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

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

After an awful day, Harriet wants some alone time. Watching Mr. Withers’ 26 cats is just what she needs…or is it?

Harriet learns about her middle initial and questions who she is. Her nanny, Ole Golly, teaches Harriet a valuable lesson about identity.

Harriet really wants to win a photo competition, but it means teaming up with someone she doesn’t see eye to eye with: her mom.

Sport and Harriet think it’s time to get rid of their beloved stuffies, but change their minds—and the narrative—thanks to Marion’s sneaky reporting.

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 Harriet is determined to help her complete it.