浪漫愛情小說作家瑪麗,勾引胖女人露絲的老公鮑伯後,倆人進而同居,但日常家居生活顯然不若偷情有趣,原有的優美浪漫氣氛全然褪色,生活有了180度的轉變,接著又發生一連串意想不到的事情,胖女人露絲在婚變後不僅煥然一新,並且展開復仇大計﹍﹍﹍Ruth is a wife and mother who tries to please her husband (Bob) but finds him pulling away and spending more time at the office than at home. When he begins an affair with a famous romance novelist (Mary) and leaves Ruth to raise their kids, she decides she's had enough of playing nice docile housewife. Ruth endeavors to show Bob and Mary the truth about themselves and each other, while creating a new successful life of her own.