Christian Wolff (Ben Affleck) is a certified public accountant (CPA) with autism spectrum disorder who uses his extraordinary mathematical skills to track financial discrepancies. He works anonymously for some of the world’s most dangerous criminals. When he takes a legitimate job at a robotics firm, he realizes the company’s books have been manipulated. Soon, the Treasury Department’s director (J.K. Simmons) closes in on him, while a rival assassin (Jon Bernthal) threatens his life.