Dan (Michael Douglas Michael Douglas) has a happy family that everyone envies. His relationship with his wife Beth (Anne Archer Anne Archer) is strong and long-term, and his daughter Allen (Ellen Hamilton Latzen) is even more clever and lovely. Accidentally, not only obsessed or somehow, Dan unexpectedly had a romantic relationship with a woman named Alex (Glenn Cross Glenn Close). When he went home, Dan was full of guilt to his wife and children. Dan swore secretly that he would never let the betrayal happen again. Unfortunately, Alex does not agree with the view, on the surface, she is a mature and stable intellectual school, but in essence, Alex has paranoia and stubbornness beyond ordinary people. In order to satisfy her own selfish desires, she constantly harassed Dan and his family, and soon, this harassment escalated into a crime. In the face of the menacing Alex, what countermeasures will Dan choose to protect his family?