Nobody can predict the future with certainty, even within the realm of their own lives. Countless times have I prepared myself to write a review when something comes up, be it the arrival of a more popular title that requires my immediate attention, an unexpected bout of burnout, or an attack from a house cat requiring medical attention. The point is that nothing in life is certain, except, perhaps, for proven mathematical certainties. In 21, the desirable skill of card counting is the showcase for a loosely-based-on-real-events story that tells the fascinating tale of a group of whiz kids beating the Vegas odds and earning themselves loads of cash thanks only to a keen eye and a computer-like brain. The game is blackjack, the stakes are your future, and the odds are in your favor with the requisite mental prowess and foreknowledge of mathematical probability on your side. It's not until you get your wires crossed, your thoughts in a jumble, get too far ahead of yourself, and perhaps become too cocky do mistakes start to happen and people want you dead, which just happens to be the basic plot of Sony's new Blu-ray release of 21.