Lawman without a Gun by Clive Dawson

Frank Kelsey had been a Dodge City marshal, enforcing gun-backed law and order, until the Dexter Brothers gang robbed the city bank and tried to shoot their way out. In the crossfire, Frank accidentally killed a young girl. Guilt-ridden, he'd turned in his star - and his guns - and headed west to seek a new life. Now, when Frank rescued rancher Jim Everley and his daughter, victims of bushwhackers, from death in the desert and led them back to their hometown, he faced a dilemma. Condor was a nest of corruption and in need of a strong lawman; a man like himself. But without a gun his life, and that of the Everleys, is in deadly danger. How Frank finally resolves his dilemma makes for a truly gripping yarn.