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.

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.

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