Coming 2026 from Viking Penguin!
I’ll be giving updates about this book in my newsletter.

Here is the deal announcement from Publisher’s Marketplace:

S.C. Godfrey’s THE ENIGMA CHALLENGE, following a quiet academic who inadvertently sets off an international puzzle-solving competition across Europe, but to play—and stay ahead of other puzzlers—she must partner up with cryptology’s notorious bad boy, whose secrets may cost them both dearly, to Jeramie Orton at Pamela Dorman Books, at auction, for publication in 2026, by Melissa Edwards at Stonesong (world).