Before Dan Brown returns with his next super-duper bestseller, Hindustan Times in association with Random House India brings you a contest. Answer three questions from Brown’s novels and you could win one copy of The Lost Symbol signed by the author. 1) Which of Da Vinci’s paintings provides a critical clue about the identity of the Holy Grail? 2) With what form of exercise does Robert Langdon usually begin a day at Harvard? 3) What’s the full name of the institution where Vittoria Vetra works?