Luis Benítez transports us in this novel to 15th century France, devastated by battles, famines and the dreaded Black Death. In this hostile and barbarous scenario slides the life of Omar de Alfarache, a young scholar, employed by the feudal family, the powerful barons of La Rigondette. "Son of Darkness" is traversed by the dark shadow of the castle's heir, Jean de la Rigondette, who returns years after the battle of Azincourt to claim the castle, turning into a demon when he wished to be a saint. Omar de Alfarache will have to face all these changes in order to survive, but also to reach a knowledge forbidden at the time.

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