Originally published in Shadow Magazine, 11/33. From the back cover:
Who Knows What Evil Lurks In The Hearts Of Men?
The Shadow knows. The phantom of darkness stalks the New York streets with a mocking laugh that chills the hearts of criminals everywhere. But in life, as in fiction, there are those who reach above the law to make their own justice at any cost. Such a man is Mox, a killer who strikes at midnight, unseen, unfelt, unheard; a man who has invented his own diabolical system of death by remote control! Here indeed is a case for The Shadow: a devestating enemy determined to erase the last living obstacle in his headlong plunge toward total power!