Do you mean the Spanish author of El Club Dumas, Arturo Pérez-Reverte? If so, I have not heard, but I am a fan of his novels, and would love to see such a film. Never heard of Camino de Santiago, is this a new novel, or a screenplay based on one of his novels?
Is it a Capitan Alatriste novel?
Booklady
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The world is a book, and those who do not travel read only a page.
--St. Augustine (354-430)