 Ultimately , when the book was published in February 2010 , it went on to become a huge commercial success . It had to be reprinted a number of times to keep up with the demand . Tripathi even changed his publisher and hosted a big launch for the book in Delhi . It was critically appreciated by some Indian reviewers , others noted that Tripathi 's writing tended to lose focus at some parts of the story . With the launch of the third installment , titled The Oath of the Vayuputras , on February 2013 , the Shiva Trilogy has become the fastest selling book series in the history of Indian publishing , with 2 @.@ 5 million copies in print and over ₹ 60 crore ( US $ 8 @.@ 9 million ) in sales . 
