Nightly News | July 15, 2013
>>> finally here tonight, you might have heard already, the big shocker in the book world , a crime novel, a good one, some thought too good for a first-time novelist no one ever heard of. then we learned the truth, and put it this way, good luck finding a copy of this book right about now the story tonight from nbc's clekeir simmons in london.
>> reporter: harry potter made jk rowling a famous name around the world. but that was nowhere to be seen in april. "the cuckoo's calling" by robert galbraith , thought to be a former military investigator, some thought too good to be a first-time author.
>> i thought a new writer and i he has got a lot of future.
>> reporter: last week, an anonymous tweet, galbraith is rowling. the paper launch and investigation.
>> there's something we need to find.
>> reporter: hired a language expert to compare the writing and found literary gold.
>> in this case, what happened when iran the statistics, every one point jk rowling .
>> reporter: rowling confess $. i hoped to keep the secret a little longer, it has been wonderful to publish without hype or expectation. she started as an unknown, showed this documentary crew this tiny apartment in scotland where it all began. fame became a burden at times but she vowed to keep writing, even after harry potter .
>> i will always write. i can't imagine stopping writing.
>> reporter: harry potter sales are close to half a billion. "the cuckoo's calling" had sold just 1500 copies, but try finding one today. no? no galbraith at all?
>> no, trying to run all over around find t.
>> reporter: it has surged to number one on amazon. no, can't find it anywhere. many think this was all a pr stunt f so it's working.
>> certainly let you have a read it i want it back.
>> reporter: publisher plans to print more, to solve another mystery, how to find another copy. keir simmons , nbc news, london.