Night Watch is a 1973 mystery thriller film directed by Brian G. Hutton from a screenplay by Tony Williamson, based on the 1972 play of the same name by Lucille Fletcher.

She calls the investigating detective, Inspector Walker, and suggests that the body of the murder victim she witnessed may be buried there.

After learning that Ellen has called Inspector Walker multiple times about the investigation, John suggests that she see his psychiatrist friend, Tony.

Indignant, Ellen continues to insist that she saw a murder in the deserted house, but since there is no proof, John remains sceptical.

That night, when both Ellen and Sarah see a light moving behind the old house's shutters, they call the police, who discover Mr. Appleby wandering around with a flashlight and arrest him for trespassing.

A second search of the house and excavation of the garden reveal nothing, and Inspector Walker privately tells John that the case is officially closed.

The next day, Ellen agrees to see Tony and, during their conversation, recounts Carl's fatal car accident.

Ellen angrily accuses John and Sarah of having an affair and plotting to torment her in order to have her committed, showing him the key to the old house.

It is revealed that Ellen had feigned insanity by claiming to have witnessed two murders in the old house as part of an elaborate scheme to murder both John and Sarah for their affair, and to weary the police with her repeated phone calls in order to dissuade them from investigating the house and finding the bodies of John and Sarah.

Brut financed the film entirely, with Taylor taking a smaller salary in exchange for a larger percentage.

Harvey said at the time that the operation was due to appendicitis, but it was in fact stomach cancer, which would kill him shortly after the picture was released.