17 December 2024: J.K. Rowling replied to someone on Twitter/X saying she was tweaking the plan for Strike 9 and jotting down ideas.

28 December 2024: J.K. Rowling replied to someone on Twitter/X saying that she had begun work on Strike 9.

25 January 2025: J.K. Rowling updated her Twitter/X header to a photo of York Minster and the city wall and said that it is a Strike 9 location.

5 April 2025: J.K. Rowling changed her header to a photo of a treehouse.

18 April 2025: J.K. Rowling changed her header to a photo of some creepy dolls.

27 June 2025: J.K. Rowling revealed to suekmoorhen on X that The Waterfront in York is a pub location in book 9.

23 August 2025: J.K. Rowling revealed on X that Pat’s birthday is the 8th of May, but we weren’t supposed to find that out until book 9, suggesting Pat’s birthday will feature in the book.

8th of May, but you weren't supposed to find that out until book 9.

— J.K. Rowling (@jk_rowling) July 23, 2025

8 September 2025: Shortly after the publication of The Hallmarked Man, J.K. Rowling posted this painting of Cupid and Psyche as a teaser for book 9.

Public service announcement for Strike and Robin fans, many of whom are saying the same things in my mentions:

I’m sorry about the emotional trauma, but I never said this would be easy. #TheHallmarkedMan#Strike9 is well underway and this picture may have some relevance to it. pic.twitter.com/eJyaYHGfkp

— J.K. Rowling (@jk_rowling) September 8, 2025

17 September 2025: J.K. Rowling changed her X header to a photo of Tower Alley and the Round Tower in Portsmouth.

29 September 2025: J.K. Rowling replied to someone on X saying she was nearing the end of Part 1 of the book.

Nearing the end of part one!

— J.K. Rowling (@jk_rowling) September 29, 2025

6 October 2025:

Remember this tweet when you read #9 is all I’m saying. Just remember…

— J.K. Rowling (@jk_rowling) October 6, 2025

18th December 2025: JK Rowling responds to a tweet asking how Robin is currently doing with: “Right now, she’s in a precarious position that Strike didn’t want her to be in.”

She also confirmed that she’d been writing Book 9 all day and that she was loving writing it.

20th December 2025: JK Rowling responded to a tweet giving Book 9 emoticons as a blue butterfly, a solitaire ring and a coffin.

23rd December 2025: JK Rowling changed her X header to a picture of a charm bracelet, and said ‘My new heading is an early Christmas present to Strike fans. (The clues are in the charms, there’s no new bracelet in #9!)’

For more information about the charms on the bracelet see our post here.

27 January 2026: JK Rowling replied to LudicrousMonica on X with the first London Strike 9 pub: Ganley’s Irish Bar in Morden, and said that Strike and Robin sit by the Derry coat of arms.