First Edition. Parkhur dustjacket art. Arizona set western adventure novel in which a Detective Agency steps in where the law fails. "As detective and as the new chief of the vigilantes, Jerry tracks his enemies through further murders, thefts, and gun scrimmages, escapes lynching, is ambushed in a saloon, searches out clues, discovers the secrets of a bullet with a microscope..." A scarce title. Very Good but for chip to cloth at upper rear spine edge, in Very Good price-clipped dustjacket, couple small chips at spine ends.