Karan Johar has announced a film based on the life of India's Research and Analysis Wing (RAW) founder RN Kao. "Turning pages into frames....an adaptation of Nitin Gokhale's book 'R.N.Kao: Gentleman Spymaster' to the silver screen," Karan tweeted. "The film will tell the story of Kao...and how he [became] a success story in the world of international espionage," he added.