Dane Hartman. The Killing Connection (1982) (Dirty Harry #9) 187 pp. [pbo]
Publishers description: Anything goes in San Francisco, but now its gone too far! Somebody is carving up beautiful lesbians—and that somebody has the right friends. Only Dirty Harry Callahan can stop the slaughter, but now both the gays and the cops stand in his way. Will he have time? The answer is at the end of a barrel—a .44 Magnum barrel!
Setting: San Francisco