Figuring the answers to the mystery lie in the old Simmons mansion, Luther Heggs (Knotts) visits the estate at the witching hour of midnight. Certain he's seen a ghost, Luther writes a story which makes front page news and brings on a libel suit from the mansion's owner. When the trial judge orders an investigation (and no apparition appears) Luther is branded a fraud. That is, until he and his devoted girlfriend team up to uncover the mystery of the hauntings (and the true murderer) in this timeless comedy classic.