by Agustín Sánchez Vidal · Suma de Letras · tapa dura · ISBN 9788496463042
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«La llave maestra» is the historical novel by Agustín Sánchez Vidal, published by Suma de Letras in 2005 in hardback (568 pages, in Spanish).
Philip II keeps a fragment of parchment with signs, one of twelve parts of a coded message hiding an ancient secret. Spy Raimundo Randa tries to gather them among Christians, Jews, and Muslims. Five hundred years later, cryptographer David Calderón faces the enigma and an unprecedented code.
First edition. The cover bears the subtitle «El mayor enigma de todos los tiempos». The work falls within historical fiction and the thriller, with elements of cryptography.
Aimed at readers of historical novels and thrillers, with an interest in cryptography, enigmas, and espionage.
Spanish art historian and author
