Arnold and Slack pulled off their stupendous con not by using a fake engineer or bribing Tiffany: All of the experts had been real. All of them honestly believed in the existence of the mine and in the value of the gems. What had fooled them all was nothing else than Arnold and Slack themselves. The two men seemed to be such rubes, such hayseeds, so naive, that no one for an instant had believed them capable of an audacious scam. The prospectors had simply observed the law of appearing more stupid than the mark—the deceiver’s First Commandment.
