by Jean d'Aillon · Editions du Masque · tapa blanda · ISBN 9782702434536
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«La conjecture de Fermat» is the historical intrigue novel by Jean d'Aillon, published by Editions du Masque in paperback (551 pages, in French).
In 1643, with the French regency weakened and the Congress of Münster looming, someone intercepts the coded dispatches. Cardinal Mazarin commissions former notary Louis Fronsac to investigate the betrayal at the Bureau du Chiffre, in a Paris of spies and false appearances, while Pierre de Fermat seeks an inviolable code.
The work is the fifth instalment in the Louis Fronsac series; it originally appeared in 2006 and this edition is from 2009.
For readers of historical mystery and espionage in seventeenth-century France.
