A Plumm Summer is an American action/family movie directed by Caroline Zelder. It stars William Baldwin, Henry Winkler, as well as model and "Inside Edition" correspondent Lisa Guerrero. The film is based on an actual event that occurred in the hometown of screenwriter T. J. Lynch, Billings, Montana. At the time there was a very popular locally produced children's TV show on the air called "Happy Herb & Froggy Doo." Happy Herb was a magician and Froggy Doo was his wisecracking string puppet sidekick. Billings was turned upside down one day in 1968 when Froggy Doo was kidnapped and held for ransom.

The FBI was actually called in to investigate the 'frognapping.' Of course the crime wasn't kidnapping, but rather was extortion because the perpetrators sent a ransom note. The incident even received national attention when it was reported on the Huntley-Brinkley Report.