Raising Cain (1992) on Netflix

The psychologist Dr. Carter Nix leaves a park with his little daughter Amy and takes a ride with the mother of another child. He tries to convince her to leave her son travel to Norway for an experiment with his father but she does not accept. Dr. Nix uses chloroform to take her boy and leaves the unconscious woman in the trunk of her car with his brother Cain to get rid of her. His wife Dr. Jenny Nix is worried about his obsession for Amy. When Jenny meets her former lover Jack in a store, she has a love affair with him and plans to leave her husband. However Carter discovers their love affair and he kills a babysitter and leaves clues incriminating Jack. Then he suffocates Jenny with a pillow, puts her body into her car and submerges it in a swamp. Carter goes to the police department claiming that his wife and his daughter are missing. He also tells that he had seen a stranger in the park. Lt. Terri and Sgt. Cally that are in charge of the investigation asks Carter to do a sketch of the suspect. However a veteran detective recalls the case of Carter's father and he summons Dr. Waldheim that discloses how deranged his father was. Out of the blue, Jenny returns and now the police needs to find where the kidnapped children are.