Strait-laced Rose breaks off relations with her party girl sister, Maggie, over an indiscretion involving Rose's boyfriend. The chilly atmosphere is broken with the arrival of Ella, the grandmother neither sister knew existed.
After discovering her boyfriend is married, Carly soon meets the wife he's been betraying. And when yet another love affair is discovered, all three women team up to plot revenge on the three-timing S.O.B.