This is a fascinating character study of a true sociopath. You usually don’t see such people until they kill a bunch of people and make headlines. But the fact is there are legions of such people that function quite well when they find suitable employment. (Which tends to be Politics, law enforcement and the corporate world) Matt Damon is wonderful as the corporate executive/scientist who gets involved in a convoluted plot that involves him blowing the whistle on his company for price fixing. He works with the FBI and is hilarious in his escapades. The plot twists and turns through out and you may not figure it out until the very end. (If you deal with such people daily as I do, you will see it coming, but Damon is great to watch as he exhibits the perfect pathologies throughout the movie) I don’t like to give away too much in my reviews, so I won’t say too much. It is a good movie and a wonderful portrayal of a personality disorder at the least and probably a diagnosable mental illness. I bet you know at least one person who fits the mold perfectly.