OK, The concept sounds far-fetched--yet somehow it works! This movie has definite charm and appeal. It's obvious it was meant as a pilot for a TV series. If it had been picked up as such with the same cast and crew, it would have rivaled Remington Steele and the other mystery/action shows of the time. If you find this version, I very much recommend it to mystery and Sherlock Holmes fans. Beware of the remake though! This same script was remade with a different cast in 1993 and it totally flopped with same material. It just goes to show how important directing and casting are to making a good movie.
You can see the reviews of the 1993 version by going here: http://www.imdb.com/title/tt0108117/
You can see the reviews of the 1993 version by going here: http://www.imdb.com/title/tt0108117/