Sexy but unstable wife and mother Jude walked out on her family three years ago. Now, just as suddenly, she is back. But her husband, Robert, has fallen in love with Callie, an assistant principal at his sons' school. He asks Jude for a divorce. She responds by trying to turn her three boys against Callie, then by slashing herself and blaming her rival and finally by drawing her 12-year-old, Kes, into a murderous plot.
SPOILER The family dog, Jocko, is unharmed. At the end of the movie, the mother takes Jocko and releases him out onto a road to cause a car accident, but Jocko is not hit and seen safe with his family shortly after.