"The mark of Cain by W. C. Tuttle" is a Western novelette written in the mid-20th century. It centers on a legendary gunman who tries to bring law and decency to a violent railroad boomtown, confronting a ruthless saloon boss and a past identity mystery marked—literally—by the “Mark of Cain.” The story follows Streak Malone, who accepts the marshal’s badge in Silver Butte and recruits outlaw Mack Shell as his deputy to face Zero Brant, the crooked kingpin behind the Silver Dollar Saloon. Streak kills imported gunfighter Dan Corteen, thwarts a masked shakedown of honest rival Jim Flack’s new Eureka Saloon, and fights through a drunken mob that wrecks the Eureka and sets it ablaze. In the chaos he rescues roulette dealer Clare Ames, who reveals Streak’s true identity as Keith Delmar and that the killer who framed his past bears an M-shaped scar—the “Mark of Cain.” Streak then confronts Brant in the Silver Dollar, recognizes the brand in Brant’s scarred brow, and battles him while knives and dynamite threats swirl. Brant flees, is thrown by Streak’s outlaw horse, and dies, ending his grip on the town. With order restored, Flack inherits the Silver Dollar, young cowboy Joe East reunites with singer Mazie, and Silver Butte turns from terror toward justice. (This is an automatically generated summary.)