AMOS FLAGG: SHOWDOWN (1969) ***½ by Clay Randall (Clifton Adams) This paperback edition published by Cornonet Books, 13 July 1970, 144pp ISBN: 0-340-12952-2 Blurb: The new marshal’s problem is that he likes to kill people, and soon the town is crawling with fast-draw artists anxious to challenge the marshal’s growing reputation as…