"Operator 13"
Written by
Robert W. Chambers
Copyright 1932
First published under this name in Cosmopolitan, August 1932 and collected in using the title Pretty Nigger.
Describes how Gail Loveless is accepted into the Secret Service and sent to the South to become part of Jeb Stuart's household servant staff. Her presence becomes vital to her mentor, friend and fellow spy, Pauline Cushman, when that woman is arrested for espionage and sentenced to hang!