What Jo says about...
Book 3: Harry Potter and the Prisoner of Azkaban ©1999

Please note: unless you see quotemarks, these are summaries, and not JKR's words themselves. Please see the linked article for the actual text.

• Her favorite bits of the books: The ending of GoF, Chapter 12 of SS/PS, the final rescue scene in CoS, and Remus Lupin in PoA. Books 2 and 4 are her favorites overall, which is weird, because "they were the most difficult to write." [Read the whole quote from the Houston Chronicle, 2001]
• JKR came close to using a chapter very like the opening one of book 6 in PS/SS, PoA and OotP. But it didn't fit properly until now. [Read the exact quote from Jo's website]
• A Patronus is a kind of spirit guardian. [Read the exact quote from ITV, 2005]
• MORE:book 1 | book 2 | book 3 | book 4 | book 5 | book 6 | book 7 | after book 7