"I don't know....I think he wants to sell his book," Narayanan, who is on a visit to Australia, told PTI.
His remarks came in response to a question on K Ragothaman's claim in his latest book Conspiracy to kill Rajiv Gandhi - From CBI files that Narayanan,
Ragothaman, who probed the Rajiv Gandhi assassination case, alleged that the issue was not pursued by the then chief of the Special Investigation Team D R Karthikeyan and Narayanan was allowed to "go scot-free".
"There was whole inquiry ... and everything is over.. and someone writes a book.. there is nothing new," Narayanan said on Thursday night.
The West Bengal governor was attending a dinner in Melbourne organised by Australia India Institute, a part of its annual conference 'Argumentative Indian'.