Format: 336 pages, Hardcover
Release Date: August 11, 2026
Publisher: Pamela Dorman Books
Source: Publisher
Genre: Thriller
Publisher: Pamela Dorman Books
Source: Publisher
Genre: Thriller
Zoe Wilder has the unflashy, solitary life of an academic, studying ciphers in literature at a California university. When her research takes her to a cryptology conference in Madrid, she’s not expecting to trigger the Enigma Challenge, a clandestine puzzle competition few dare to enter.
The Enigma Challenge is an infamous competition with impossibly high stakes: Lose, and your identity is wiped forever. It doesn’t take long for Zoe to realize that she’s in over her head. Enter Dane Seaver: the mysterious hacker who insists they team up. Dane knows the Enigma Challenge—its secrets, its players—and Zoe knows ciphers. For better or worse, they need each other.
Six days, five puzzles, three countries, and innumerable rivals. What’s more, the spark of attraction between them becomes harder to ignore, but distractions are dangerous. With twelve million dollars and multiple lives on the line, the Enigma Challenge is anyone’s game. Will Zoe and Dane come out unscathed against the other players—and each other?
Story Locale: Madrid; Barcelona; Paris; Edinburgh
The Enigma Challenge is an infamous competition with impossibly high stakes: Lose, and your identity is wiped forever. It doesn’t take long for Zoe to realize that she’s in over her head. Enter Dane Seaver: the mysterious hacker who insists they team up. Dane knows the Enigma Challenge—its secrets, its players—and Zoe knows ciphers. For better or worse, they need each other.
Six days, five puzzles, three countries, and innumerable rivals. What’s more, the spark of attraction between them becomes harder to ignore, but distractions are dangerous. With twelve million dollars and multiple lives on the line, the Enigma Challenge is anyone’s game. Will Zoe and Dane come out unscathed against the other players—and each other?
Story Locale: Madrid; Barcelona; Paris; Edinburgh
S.C. Godfrey’s The Enigma Challenge is a high-speed thriller that treats codebreaking as both the engine of the plot and the metaphor for a bad relationship. This one is designed as an action vehicle with an open-door love story bolted on, and that hybrid is both its selling point and the source of the split verdict. Zoe Wilder, a thirty-year-old postdoc who studies literary ciphers at the fictional Bay Area university Chessmont, arrives in Madrid for the International Conference on Cryptology to present a paper and to end things with Eric, her boyfriend and her boss.
The conference is also the kickoff for the Enigma Challenge, a clandestine competition of five puzzles, a rumored multi-million-dollar purse ($12 million), and a penalty that makes ordinary defeat look mild: lose, and the organizers “delete” you—bank accounts, degrees, credit, identity, gone. Zoe solves the throwaway opening puzzle at the Ángel Caído in Retiro Park, the mass text goes out, and she is suddenly the target. She teams up with Dane Seaver, a previous two-time winner, hacker, academic bad boy, and the man Eric specifically told her to avoid.
Six days, five ciphers, a route that runs Madrid–Barcelona–Paris–Edinburgh and on into the Scottish Highlands and Inverness, and a growing list of rivals who will threaten, attack, and kill to stay in the game. Godfrey has been frank about the lineage. The spark was not The Da Vinci Code but Kit Williams’s 1979 picture-puzzle book Masquerade, which she loved as a child; the ciphers themselves were built with the help of Elonka Dunin and Klaus Schmeh’s practical codebreaking guide, and Dunin reportedly solved the book’s puzzles on a Zoom call. That research shows.
Zoe walks readers through Caesar, pigpen, Playfair, columnar transposition, and the rest, and the novel is written so you can try the puzzles or simply watch her solve them. Real sites—the fallen angel in Retiro, the cloisters of Barcelona Cathedral, Arthur’s Seat—are used as clue locations rather than postcard backdrops, which is one of the book’s cleaner pleasures. Once the challenge starts, the pair barely stop moving. Zoe is smart and spunky; Dane is abs with a vulnerable heart; the villains are extremely villainous.
Godfrey has said the romance was written in service of the thriller, not the other way around, and that she did not hold back on either the sex scene or the violence. That matches the book’s self-description. The emotional through-line that actually works is Zoe’s exit from a toxic workplace relationship, and her inherited love of puzzles, shared with a late father. Dane functions more as a guide, bankroll, and romantic obstacle than as a fully independent mystery, at least until the late revelations the ending is built to protect. The last page is a deliberate cliffhanger. Godfrey has said the next book is not a direct sequel but another story in the same world, with related characters.
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