Donald Glourie shares his crumbling ancestral home with the ghost of his Highland ancestor, Murdoch, who has been condemned to haunt the castle until he avenges a 200-year-old insult from a rival clan. To clear his mounting debts, Donald sells the dilapidated pile to an American businessman, Mr Martin, who has the castle complete with the Glourie ghost transported and rebuilt in Florida. While old-world gentility rubs up comically against 20th-century materialism, Martin's daughter takes a liking to both Donald and Murdoch, convinced they are one and the same man...