LONDON, ENGLAND - FEBRUARY 12:  J.K. Rowling attends the 70th EE British Academy Film Awards (BAFTA) at Royal Albert Hall on
Jeff Spicer/Getty Images

This morning, a reader asked Harry Potter author/Fantastic Beasts and Where to Find Them screenwriter J.K. Rowling for a hint about the title of her next novel. A half-hour later, Rowling, a perennial Twittermaster, responded:

The book in question is another under Rowling's pseudonym/dudeonym, Robert Galbraith. It'll be the fourth mystery tale centered around English detective Cormoran Strike.

In less than an hour, someone guessed the title:

So Lethal White will follow The Cuckoo's Calling, The Silkworm and Career of Evil, released annually from 2013-'15. Rowling has previously said she plans to do seven Cormoran Strike novels. She also informed us in December she's working on two novels simultaneously.

Some highlights from the title-guessing adventure:

When the dust had settled, Rowling hunkered down at her desk in Gryffindor Tower and resumed her work.

While you're in J.K.'s universe, flash back a decade and watch a young Daniel Radcliffe chatting with Fuse: