The Red Lady of San Francisco — J.R. Roberts

Clint is in San Francisco, hoping to stay out of trouble. After a night at the theater he meets the woman who runs it. She's known as the Red Lady, but while her theater is a perfectly respectable place, the people in Frisco consider her little more than a whore. When attempts are made to hurt or kill her, she enlists the Gunsmith to be her bodyguard.