When I was about fourteen, I started reading Ellery Queen novels, some of which were being reprinted and available in the local library. There was also a recently published book, A Study in Terror, which involved Sherlock Holmes and Jack the Ripper. I read it, but was underwhelmed. Many years later, I learned that the book had been written primarily by a minor author called Paul W. Fairman, and that it was a novelisation of a film which had come and gone in the mid-60s without making any impact on my consciousness. The book wasn't bad, but it rather illustrated the weakness of the later ghost-written Ellery Queens - the new writers were (even though some were very capable) generally not as talented as the original pair of authors.
At long last I've watched the film which inspired the book. It features John Neville as Holmes and a slightly uncomfortable Donald Houston as Watson. The cast is generally high calibre, with stars ranging from Judi Dench to Adrienne Corri and Barbara Windsor and from Frank Finlay to Robert Morley and Anthony Quayle. A lot of talent there! Neville isn't bad as Holmes but his portrayal is subdued. He doesn't get under the skin of the great detective in the way that Jeremy Brett or Douglas Wilmer did.
I needn't detain you too long with a summary of the plot. A madman is out on the streets of Whitechapel, murdering sex workers. A mysterious package of medical instruments is sent to Holmes, prompting him to investigate. The script is workmanlike, with several clumsy lines when you think: 'Holmes would never have said that!' But it's watchable.
The script was written by Derek Ford and his brother Donald, though apparently it needed a lot of improvement before the film was made. Derek's later films included The Wife Swappers, Keep it Up, Jack, and What's Up, Nurse?, so he wasn't exactly Billy Wilder or Ben Hecht. When Wilder did become involved with a Sherlock Holmes film, the results was a superior film, The Private Life of Sherlock Holmes.