Don Markstein’s Toonopedia has this to say about the characters:
“. . . comic book characters can be awfully dense about not recognizing each other if there's a mask in the way . . . But their relationship was never given a chance to develop. The Black Orchid and The Scarlet Nemesis had only one adventure, then disappeared without a trace.”
The article credits George Tuska with the art. Jim Vadeboncoeur Jr credits Ken Battefield and an unknown inker for the job. I am with Jim on this — it is not a Tuska job.
There is another character in this story, an eccentric “retired millionaire,” Jim Crow. Crow wants to knock down all the buildings to make more room for the pigeons. Can it be that there was a writer and an editor in those days who did not recognize the name “Jim Crow” as being the term used for racial segregation in the American South? You can read more about Jim Crow. This story, from All New Short Story Comics #2 (1943) is a curiosity that leaves one puzzled.