This is one film in which one can see the better title given it on release outside of the UK. There it was called "The Passionate Stranger." It's a real stretch to see that in the main character, Carlo and Mario, played by Carlo Giustini. It's much easier to see something sinister in both of his characters, but not at first. That's in his real person of Carlo, and then in his fictitious character of Mario, whom he assumes from reading the script of Judith Wynter's novel.
Where the author titles her novel, "The Passionate Stranger," movie audiences see him as not passionate, but lecherous and with evil in his heart. Carlo imagines the affair of the novel to be a real portrayal of how Mrs. Wynter feels. But moviegoers know that not to be true, yet he changes his persona and pursues the married wife of his employer. Clearly, the affair was just in the novel and not real - ergo, the much better title for the film.
That this movie was billed as a comedy is really something. I would bet that nine out of 10 people who watch it would see it developing as a real crime story. Indeed, with the sudden change in Carlo's character, I couldn't help but think of and liken this film to "Dr. Jekyll and Mr. Hyde." In the Robert Louis Stevenson story, Dr. Jekyll takes a potion that turns him from a gentle soul into a murdering madman. In this movie, Carlo speed reads a novel that turns him from an affable, polite and decent chap, into a lecherous predator.
The idea for this story and film is clever, but not entirely new. And, the film seems awfully slow. The sinisterness of the novel plot, which takes up about two-thirds of the film, casts a pall on what little humor there is. Not until the end of the film, is there any humor - and that mostly between Ralph Richardson's Roger Wynter and his wife, Judith. That doesn't qualify "A Novel Affair" as a comedy by any stretch of the imagination. No, this was an experimental plot, it seems, that just didn't work.
It was most difficult for me to stay with it to get past the enactment of the novel within the story. I'm glad I finally did, or I would have rated this 1 or 2. Most movie fans today, I would guess, would also find this movie hard to sit through. Although it's fine for those who like to nap during movie times.
All of the cast do well, but Richardson and Leighton have very little screen time and so few lines. The best performance is clearly by Patricia Dainton as Emily and Betty.