Living alone and independent for too many years, Daisy Fields has somehow forgotten how to have fun. So when her mother suggests a new hobby — letterboxing — Daisy decides to give it a try.

But Daisy’s first letterboxing attempt, at her favorite childhood park, provides more excitement than she expected. When spooky incidents related to a local legend begin to drive people away from the park that Daisy holds dear, she vows to fight back.

Despite her vow, Daisy’s relationship with the newcomer in town keeps her too busy to return to the park for the letterbox. It’s her strong-willed independence that tests that relationship and puts her life in danger.