JK Rowling has finished the next Strike novel.

Last month, the author teased fans with a Twitter post revealing she was nearing the end of her latest book following the adventures of private investigator Cormoran Strike.

Called Lethal White, the novel will be the fourth written by Rowling under the pseudonym Robert Galbraith.

And it seems fans won't have long to wait before they can get their hands on a copy, as Rowling revealed on Twitter on Friday afternoon (March 23) that she has officially finished writing it.

This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. Finished. #LethalWhite pic.twitter.com/4VHWDZf0fO — J.K. Rowling (@jk_rowling) March 23, 2018

"Finished," the author wrote next to "#LethalWhite".

Lethal White follows the previous Strike books The Cuckoo's Calling, Silkworm and Career of Evil.

All three have been adapted into a BBC series, with the conclusion of the third mystery airing earlier this month and leaving fans wanting more.

There were in fact concerns about whether Lethal White would ever be ready, after Rowling revealed ideas about Harry Potter spin-off film series Fantastic Beasts were driving her to distraction.

This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. The murderer’s being unmasked RIGHT NOW in #LethalWhite, but I stopped to watch the #FantasticBeasts trailer, had a sudden idea for the third script, wrote it down, went sprinting back to Strike and Robin and now my brain’s turned into cluebeastwizardmurderweapony soup. Need tea. — J.K. Rowling (@jk_rowling) March 13, 2018

But, phew! We never doubted you really, JK.

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With Fantastic Beasts: The Crimes of Grindelwald and Lethal White now on the horizon, it looks like we have a lot more Rowling magic to come this year and next.

So, grab a pen, George RR Martin – this is how not to keep fans waiting for years and years and years for the release of a much-anticipated sequel novel.

And grab a glass of wine/beer/beverage of choice, JK – you've more than earned it.

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