The Spanish Academy of Fine Arts is forced to auction off several valuable antique books. The librarian of the Montserrat Academy is entrusted with contacting the second-hand bookseller and finding out their exact value. Her lover, the young architect Jose, volunteers to accompany her to the negotiations. However, the second-hand bookseller hints that there is a “special” buyer for one of the manuscripts who is willing to pay a fairly large sum...Montserrat and Jose, who decided to accept this offer, do not even suspect: a profitable deal could cost them their lives .Because the rare publication is being hunted by mysterious strangers who intend to destroy everyone who knows about its existence...