During the 1960s, Las Vegas began to emerge as a mecca of gambling and entertainment, attracting outsiders that included mobsters looking for a piece of the action. When a casino worker is murdered, the mayor remembers local rancher Ralph Lamb's turn as a military police officer and asks him to look into the crime, setting off a clash between Lamb and Chicago gangster Vincent Savino. As sheriff, Lamb is joined by his two deputies, his brother, Jack, and his son, Dixon, in the fight to keep order in his city and keep Savino's corrupting forces at bay.