The story begins with Venkat Subhramaniam (Amitabh Bachchan), an Indian professor of mathematics, software engineering, and a genius, teaching mathematics in his village to kids when a postman comes with a letter. The letter is from British mathematician Perci Trachtenberg (Ben Kingsley), widely regarded as the world's greatest living mathematician, who invites Venkat to a high rolling casino in London. Venkat tells Perci about an equation that could not only change the dialogue on mathematics forever, but one that has already left an indelible impression of guilt — for many painful reasons — on Venkat's life. It is shown in the past that the reclusive genius Venkat has cracked a theory that could redefine the principles of probability and randomness. Venkat tries to use this experiment in a game called Teen Patti (a Poker), which he plays on the Internet. According to this experiment if a person playing Teen Patti knows the three cards with one of the players (except him) he/she can guess the other cards with the rest of the players and therefore can guess who is going to win with the theory of probability.