Night Watch (1973)

Ellen lives a comfortable life in an enviable home with her successful husband. On a rainy night, she claims to have seen a bloody corpse through the window of the boarded-up house next door. The cops, her husband, and the friend who's visiting all take it seriously, but no evidence of a body is found. Her continued insistence as well as her new reports of suspicious goings-on make her a bit of a joke to the police and begin to worry her husband and friend.

This is a surprisingly effective mystery with an ending I didn't see coming. Somehow, though, it feels a bit cheap, like an old network movie-of-the-week.

C+