Christian Wolff (Ben Affleck), a silent and mysterious mathematical genius, works in the obscure accounting industry, specializing in accounting for major criminal organizations around the world. As Treasury official Ray King (J.K. Simmons) pays attention to financial crimes, Christian finds a legitimate artificial intelligence company client as a cover, and the company's accountant (Anna Kendrick) seems to have discovered a financial discrepancy of millions of dollars. Christian will face not only the investigation of the authorities, but also more serious personal danger.