Stop at Nothing (1991)

A woman believes that her husband is molesting their daughter. Unfortunately she can't prove it, so when the courts grant him custody, she is approached by a woman who went through the same thing and unfortunately was not able to help her child. She offers to help her get her daughter and help them disappear. However, her husband has hired a private investigator to find them and she is good. However, the investigator starts to wonder if her client is guilty or not.