One day, while Katie Hatcliffe ("Mrs Hat") is shopping, she sees her double, Sonya Redfern ("Mrs Red"). Intrigued, she follows Mrs Red home and discovers both Mrs Red's glamorous lifestyle and her plans to leave her husband. Mrs Hat takes Mrs Red's place and makes good use of the opportunity to live her dream life as the wife of a wealthy businessman. But. . . what will happen when the deception is discovered?