Responsible for cleaning the homes of the rich, Mrs Harris is a humble charlady with a knack for putting things in order wherever she goes. When much to her surprise she wins a trip for two behind the Iron Curtain, she has no idea of the adventure that awaits her. Ever the loyal servant, however, Mrs Harris (accompanied by her loyal friend Mrs Butterfield) believes it only right that others benefit from her good fortune as well. With a mink coat in mind for Mrs Butterfield, she also hopes to use their holiday to reignite a romance between her lovelorn employer and a Russian woman he loved years ago. Unfortunately, the discreet passing of documents can land even the most well-intentioned charlady in hot water with the KGB...