A crooked businessman Mohanlal Sabbarwahl (Ravi Kissen) swindles people of their hard-earned money and frames an honest bank officer, Mr. Baweja, and his assistant Zaira. Unable to handle the humiliation of having been arrested, Baweja dies due to cardiac arrest. Now Sukhi (Tusshar Kapoor), Mrs. Baweja aka mummyji (Dolly Ahluwalia), Zaira's husband Mintoo (Vinay Pathak) and their well-wisher Ballu (Ranvir Shorey) must somehow return 15 crore to the investors to save Baweja's name and to free Zaira. They devise various plans to con Sabbarwahl and strategically loot back the investor's money.