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 beyond the Iron Curtain, she has no idea of the adventure that lies ahead of 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 lost romance between her lovelorn employer and a Russian woman he had loved years ago. Unfortunately, the discreet passing of documents is an activity which can land even the most well-intentioned charlady in hot water with the KGB.