Mitchell Grandin is a prominent citizen of Chicago. As a former councilman and organizer of many charitable events, he has gained a reputation that he tries to put to good use. He's also trying to get the concessions for a major international fair and exposition celebrating Chicago's centenary and has hired a hit man to get rid of his competitors. When Eliot Ness tells the organizing committee that Grandin may be dirty, he finds himself being sued for slander to the tune of $500,000. His only possible defense is to prove that his suspicions are correct.