Michael Clayton, the criminal prosecutor (George Clooney George Clooney), had a big time in the legal profession in New York. After leaving, he worked for a large private law firm. At the urging of the new boss Marty Bacher (Sidney Pollack Sydney Pollack), he began the work of cleaning up bad records. But his work and personal life have also changed: his wife and children have left him, and debt has tarnished his former glory. His financial situation forced him to continue to suffer at work. At the same time, he was embroiled in a multimillion-dollar class action lawsuit over the company's dirty business. While he is using his relationship and rich experience to "clear the fog" to successfully solve this lawsuit, the involvement of Arthur Edens (Tom Wilkinson Tom Wilkinson), another clerk under the boss, and Karen Crowder (Tilda Swinton Tilda Swinton), a female litigator, makes Michael's career and life face a new round of severe challenges again.