The bespectacled boy wizard made his final appearance in Harry Potter and the Deathly Hallows in July 2007.
She has never ruled out a comeback, so fans got their wands in a whirl when the 49-year-old tweeted on Monday:
Cry, foe! Run amok! Fa awry! My wand won't tolerate this nonsense.
- J.K. Rowling (@jk_rowling) October 6, 2014
Followers were quick to see the message as an anagram and claimed it translated as: "Harry returns! Won't say any details now. A week off. No comment."
JK then followed up with a series of tweets challenging them to solve the riddle until Emily Strong, a PhD student at the University of Sheffield who is as a lover of 'all things Harry Potter', tweeted the solution:
- Emily Strong (@EmyBemy2) October 7, 2014
JK was quick to confirm she was right. Tweeting:
.@EmyBemy2 YES!!!!!!!!!!!! People, we have a winner!
- J.K. Rowling (@jk_rowling) October 7, 2014
Newt Scamander is the star of her Harry Potter spin-off, Fantastic Beasts And Where To Find Them, which is set to become a film trilogy. Set in 1920s New York, he is a magizoologist - dealing with magical creatures.
After all the kerfuffle, JK tweeted: "Thank you, thank you, for being the kind of people who get excited about an anagram."
A statement on the author's website says in reply to the question of whether there will be another Harry Potter novel: "I have always refused to say 'never' to this question, because I think it would be foolish to rule out something I might want to do in a few years' time.
"However, I have no immediate plans to write another Harry Potter novel, and I do think that I have rounded off Harry's story in the seven published books."
The Harry Potter series of seven books has sold more than 450 million copies.
Suggested For You
SUBSCRIBE AND FOLLOW
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements.Learn more