Angry and bitter after throwing out her unfaithful husband, Julia is only too ready to succumb to the good-looking Welshman who comes ostensibly to update her husband's computer. Julia enjoys playing games with the computer, particularly when it invites her to play the Murder Game and she can fantasise about how easy it would be to commit the perfect murder by computer with her errant husband as victim. However, stopping the program the next morning isn't so easy ...