What was Mark Whitacre thinking? A rising star at agri-industry giant Archer Daniels Midland (ADM), Whitacre (Matt Damon) suddenly turns whistleblower. Even as he exposes his company's multi-national price-fixing conspiracy to the FBI, Whitacre envisions himself being hailed as a hero of the common man and handed a promotion. But before all that can happen, the FBI needs evidence, so Whitacre eagerly agrees to wear a wire and carry a hidden tape recorder in his briefcase, imagining himself as a kind of de facto secret agent.

Unfortunately for the FBI, their lead witness hasn't been quite so forthcoming about helping himself to the corporate coffers. Whitacre's ever-changing account frustrates the agents (Scott Bakula and Joel McHale) and threatens the case against ADM as it becomes almost impossible to decipher what is real and what is the product of Whitacre's active imagination.