It stars Amitabh Bachchan, Ben Kingsley, R. Madhavan, Raima Sen and Shraddha Kapoor, who made her acting debut.

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 Teen Patti.

It is shown in the past that the reclusive genius Venkat has cracked a theory that could redefine the principles of probability and randomness.

Shantanu tells him that he should try using his theory in the real world, where there are people who actually gamble and play Teen Patti, i.e. in underground dens or "addas".

Although Venkat has no interest in the money that could come from practicing his equation to crack Teen Patti, he eventually succumbs to Shantanu's charismatic persuasion.

Later, another student from the institute, Abbas (Vaibhav Talwar), the rich, spoiled brat, joins the gang and arranges for them parties in casinos, private clubs, etc.