There hasn’t been a more compelling cautionary tale for our times than Rajat Gupta’s abrupt downfall after his fairytale rise from the portals of IIT and Harvard. It’s a question many have asked: why did he throw it all away by sharing privileged information with Sri Lankan Raj Rajaratnam, head of Galleon hedge fund? The entire saga has been captured brilliantly by business journalist Anita Raghavan in her book The Billionaire’s Apprentice. She took some questions from Sunit Arora. Excerpts: