He is known for his legal acumen and skills in the court room. But he has also been ridiculed for his zero loss theory in the telecom scam. Now in the opposition, the former union minister has followed in the footsteps of his colleagues in writing a book criticising the Modi government and defending Congress government's track record. On "Walk The Talk", Kapil Sibal speaks to Shekhar Gupta about his book and why he still stands by zero loss theory, defends his colleagues in court cases and his news venture.