Dean Corso hunts books, old and rare books. His methods of acquisition are not always decent which recommends him to Boris Balkan, a collector with a dark goal - to summon the devil with the help of a book. Balkan has one edition and wants Corso to get the other two for him. A wild trip begins ... and who is that mysterious girl who keeps helping him and has eyes that sometimes turn green? When the book gets stolen from Corso's hotel room, he suspects the former owner's wife and her associate. He and the mysterious girl go to her hotel. Girl: "What do you plan to do if you see them?" Corso: "Probably hide behind you."