In the world of rare books everything has its price. But when the
book is a satanic tract, the currency is not money but life. A
well-know bibliophile is found hanged days after selling a rare
manuscript of Alexander Dumas's classic, The Three Musketeers.
Across Madrid, Spain's wealthiest book dealer has finally laid his
hands on a 17th-century manual for summoning the devil. Lucas
Corso, solitary and obsessive, is the detective hired to
authenticate both texts. But the further he follows the trail of
devil worship, the more it leads him back to Dumas. He's the
unwitting protagonist in someone's evil plot, but is he sleuth or
hero, Sherlock Holmes or d'Artagnan?