The market for snake oil is on the decline, so a peddler and his sons expand their con game with murder.
"Professor" Eliot cows his three grown sons into submission while he peddles his patent medicine. Unlike most con men, however, these men also are killers. When, disguised as Indians, they attack a stagecoach, they arouse passions in the white settlers that may lead to yet more bloodshed.—Morganalee