When I watched this movie on DVD, the plot and characters seemed familiar. I realized that the story was based on an episode in the "Peter Duluth" series by Patrick Quentin. For some reason, they changed the character's name to Peter Denver - maybe they thought it was easier to pronounce.
"Patrick Quentin" was a pen name used by four different writers in various combinations from around 1930 into the 1960s. They also used the names Q. Patrick and Jonathan Stagge. See the Wikipedia article on Patrick Quentin for more details.
The best known Patrick Quentin novels are those featuring Peter Duluth, a Broadway producer, and his wife Iris, a famous actress. They solve mysteries in the glamorous New York theatre world - a bit like Nick and Nora Charles. Most of these novels have the word "puzzle" in the title - "Puzzle for Fools", "Puzzle for Players", etc. "Black Widow", published in 1952, was an exception to the title pattern. All of the Duluth novels I have read have been very entertaining "Golden Age" mysteries, and I highly recommend them to mystery fans. In fact, all of the books by Patrick Quentin or any of his pseudonyms that I have read have been very good mysteries.
I was surprised that this script was given such high-end treatment - Cinemascope Technicolor and stereo sound. The script is a bit old fashioned, with its narration and flashbacks, and the cast is so-so. I think Peter Duluth was intended to be a more dashing character than the rather frumpy Van Heflin could convey. Cary Grant would have been perfect in the role. I still found it an entertaining 90 minutes. But check out the Peter Duluth books for a truly good read.
