This is a spy thriller based on the Robert Ludlum novel about a spy who has lost his memory but not his skills as a spy and therefore his skills as a movie action hero. I enjoy watching Matt Damon become an action hero but frankly watching Matt work is the best part of this movie. The story is not credible but is simply a vehicle for shooting one fast action scene after another. If you enjoy action hero movies with lots of action and lots of speed without much story or thought, you will like this movie.