I watched this last night on TCM and found it not only thoroughly entertaining but a textbook example of how a B-grade picture from a poverty row studio could rise above its budget limitations thanks to the efforts of a clever director (William Castle) and strong players (Richard Dix and J. Carroll Naish in particular). Superior in some respects to entries in parallel series based on radio programs (like Universal's Inner Sanctum with Lon Chaney, Jr.), perhaps the most appealing aspect of "The Whistler" is the economy with which the story is told. There are no needless lines, no needless scenes. Whether it belongs within the "noir" cycle is a matter to be debated, but nevertheless "The Whistler" has its share of the quirky characters and shadowy settings that typify that genre, not to mention the creepy portrayal by Naish of a hit-man who reads a monograph on "necrophobia" in his spare time.