Don Knotts stars as a timid typesetter who hasn't a ghost of a chance of becoming a reporter – until he decides to solve a murder mystery and ends up spending a fright-filled night in a haunted house! 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.