JK Rowling has promised fans that they won't have to wait too long for the fifth Harry Potter book.
Demand for Book Five has grown even more since the film of the first book had its world premiere in London at the weekend and got rave reviews.
Millionaire author JK went back to her home in Edinburgh for a special charity screening of the film, and admitted she was busy writing.
When asked when the fifth book would be out, JK said: "That's the question I get asked more than any, and I still don't know.
"It's still not finished but I am writing very hard, so it shouldn't be too long."
JK wrote the majority of the Harry Potter books in a cafe in Edinburgh, with her then new-born daughter Jessica at her side.
Security surrounding the fifth book is as tight as ever, although JK admitted she had let slip a few secrets to Potter film stars Robbie Coltrane and Alan Rickman (who play Hagrid and Snape) to help them 'get into character'.