JackLinden(MarkRuffalo)andHankEvans(PeterKrause)arebestfriendswhobothteachatthesameuniversityinasmallNewEnglandtown.TheybothhaveyoungchildrenandJackswife,Terry(LauraDern)isclosewithHankswife,Edith(NaomiWatts).Butwhilethingsappearhappyonthesurface,therearesmoulderingpocketsofdiscontentunderneath.FinancialstruggleanddomesticboredomhasdrainedthepassionfromJackandTerrysmarriage,whileHanksnumerousinfidelitiesandself-absorptionhaspromptedEdithtofindbothcomfortandsexualfulfilmentwithJack.AsJackbeginsspendingmoreandmoretimewithEdith,itbecomesobvioustoTerry,whoseangerculminatesinasexualencounterwithHank.Nowthatthedeceptionhascomefullcircle,bothcouplesarelefttodecidethefuturesoftheirshatteredunions...