Never a conventional princess, Harriet becomes an adventurer after learning she is cursed to fall into a deep sleep on her twelfth birthday, but after two years of slaying ogres, cliff-diving, and more with her riding quail, Mumfrey, things go awry at home and she must seek a prince to set things right.

Not only must Danny and Wendell trick-or-treat with skeptical classmate Christiana, school bully Big Eddy dares them to enter a haunted house on Halloween night, where they may have to sacrifice their candy to a ghost.

A little girl in a red cape asks for Princess Harriet Hamsterbone's help with a pack of weasel-wolves who want to eat her grandmother, but after meeting everyone, Harriet is not sure whom to trust.

When a fairy godmouse forces Whiskerella to wear glass slippers and attend balls night after night in search of a happily ever after, it's up to Princess Harriet Hamsterbone to break the spell and save the day.