Lucas Corso, an authority on rare books, makes his living tracking down valuable items for rich bibliophiles. His latest assignment, deciphering the mystery of a 17th century book that legend has was co-written by Satan, a book for which only three copies are known to exist, has become a very dangerous adventure. As if this werent enough, a handwritten chapter of Alexandre Dumas The Three Musketeers comes into play. The stories intermingle and result in a page-turning thriller distinctive of Perez Revertes writing. The book was taken to the big screen in a movie titled The Ninth Gate by renowned director Roman Polanski..