Potshot, Arizona, a former mining town, has been reborn as a paradise for Los Angeles millionaires looking for a place to escape the pressures of their high-flying lifestyles. But this western idyll is threatened by a local gang, the local police seem helpless. Led by a charismatic individual known only as The Preacher, this motley band of thieves selectively exploits the town, nuturing it as a source of wealth while systematically robbing the residents blind. Enter Spenser, who has been hired by the comely Mary Lou Buckman to investigate the murder of her husband. It is Mary Lou's belief that when her husband refused to pay The Preacher and his men protection money he was killed. Without any witnesses, Spenser has little to go on, and it's clear the local police chief won't be doing much to help. Calling on his on cadre of tried-and-true cohorts, Spenser must find a way to beat the gang at their own dangerous game.