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

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

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

The fallout from her private thoughts becoming public leaves Harriet fighting to repair her friendships—and for the return of her notebook.

At the world's fair, Harriet meets a 14-year-old photographer who's unsure of his future—but shows Harriet how to cherish today.

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

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

Sport joins Harriet for a local scavenger hunt. But when he brings his good-luck charm to improve their chances, Harriet is skeptical.

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

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.

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.