There are a lot of uknowns in regards to the film Unknown. Let me run a few of them down for you. First, it is unknown why any of the events in the film are taking place. If you kindly suspend your disbelief that there could possibly be a large scale public attempt to assassinate a botanist in a manner where the collateral damage is definite and the magnitude of said damage is impossible to calculate then, by all means, proceed to delve into the miasma. The second unknown is why anyone would have us believe that January Jones is a skilled, identity shifting assassin. The only role I've ever seen her nail is bored housewife. Another Unknown is whether or not the writer or director did any research into traumatic brain injury. The whole plot hinges on a TBI, as they're called in the biz, and it just doesn't seem like they had any idea what they were doing with that plot point. Hitting your head and easing the blood flow to the brain a little bit would not, probably, under any circumstances, force an assassin to "believe his cover" was his true identity. Did that guy who fell off the stage playing Spider Man go through a period where he thought he was Spider Man? I don't think so. Probably the biggest unknown in Unknown is whether there is a movie goer in America whose chief cinematic dream was to see Liam Neeson go balls deep in Aiden Quinn during the final fight scene.