Jim Watt runs the London office of a stock exchange firm and is hosting dinner for the International Director and his wife, Bill and Nancy McGregor, members of the anti-permissive society group. As Bill strongly disapproves of unmarried couples living together, Jim asks his girlfriend, Helen, to pose as his wife for the evening. This suggestion goes down like a lead balloon and Helen walks out on him, leaving Jim with no partner, no cook and only one last option - his eccentric cleaning lady, Edna, who will do the job for a fee, of course. Disaster reigns as Edna attempts to cook an elaborate dish while keeping her guests happy with religious chat. At an extremely inopportune moment, Helen returns to play the role of his wife, and so does his young personal assistant, Terri. A string of hilarious mis communications unravel as Jim trades lies and wives almost as quickly as Bill is trading shares.