In a desperate attempt to hold onto his ancestral home in Ireland, Lord Peter Plunkett and his staff conspire to market the castle as a haunted hotel. Amongst the first coach load of American guests are Jack and Sharon, on a second honeymoon to revive a flagging marriage. During the first night of their stay, the guests duly witness a motley crew of ghosts sweeping through the castle but these are quickly unveiled as the castle staff in costume. Feeling cheated, the guests decide to leave en masse the next morning. At this point, however, the castle's real ghosts take a hand to save the castle, prompting a mass haunting.