 The film follows a mathematics professor, played by Bachchan, who is trying to write a thesis on probability and relates it to the Indian card game of Teen Patti.The story begins with Venkat Subramaniam (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.