In the present, protagonists Dafne, Oliver, and Iris must follow the "Agatha Key" (a set of clues left by the author) to find the relic before it falls into the wrong hands.

Alejandra de San Cristóbal is a Spanish social educator and author known for weaving into her thrillers. Her other works, like "La sombra de la Gioconda" , follow a similar pattern, reimagining famous events like the 1911 theft of the Mona Lisa.

Reviewers describe the book as having a "frenetic" rhythm, treating the plot as a symbolic large-scale escape room that blends historical fiction with fantasy and suspense. About the Author

The plot bridges two eras, beginning with the real-life 1926 disappearance of Agatha Christie . It suggests that during those 11 missing days, Christie was guarding a dangerous relic that could destroy the world.

In the novel (2021) by Alejandra de San Cristóbal , the standout feature is its "Escape Room" narrative structure . The story is designed as a frenetic race against time, where the characters—and the readers—must solve an ingenious chain of puzzles, riddles, and cryptographic clues to advance. Key Narrative Elements

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