This is quite an enjoyable thriller with a strong performance from Edward Arnold as "Jim McLain" - a blind detective who is sought out by his old pal "Norma" (Ann Harding) to try to help her put off one of her old boyfriends who is courting her 17 year old stepdaughter. When the cradle-snatcher is found murdered and his friend is the chief suspect, he arrives at her home with his agile guide dog "Friday" and soon discovers a complex Nazi plot to obtain secret papers from her husband. Frankly, the plot's all a bit far-fetched, but Arnold is on super form - especially on the organ, as is his very fleet-of-foot canine companion. Mantan Moreland also shows up now and again in his usual butler's guise to add a little humour to the proceedings and all in all this is a decent piece of wartime cinema.