Soon after landing a plum job working for FBI operative Robert Hanssen (Chris Cooper), Eric O'Neill (Ryan Phillippe) realizes he's been brought in to spy on his boss, who's suspected of selling secrets to the Soviets. But can O'Neill handle such an important assignment with so little field experience, or will Hanssen get to him first? Laura Linney and Dennis Haysbert also star in director Billy Ray's high-stakes thriller based on a true story.