[Transcriber Note: This etext was produced from Galaxy Science Fiction February 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] It began with the dead cat on the fire escape and ended with the green monster in the incinerator chute, but still, it wouldn't be quite fair to blame it all on the neighborhood.... The apartment house was in the heart of the district that is known as "The Tenderloin"—that section of San Francisco from Elli