The book had been brought by a Greek man who was a traveler. The Greek man wanted the book repaired for him, and he did not come back to get it, which was actually baffling as the man seemed very concerned about the book.
Nevertheless, it was past the agreed date. Thus, he could do whatever he wanted with it. He tried to sell it, but no one seemed interested in it.
Until the time Portia got the book. In fact, she did not think it would be of any use in her life, but she just read it anyway.
What they did not know was that the man who had left the book there was not human.
He was a warlock and had come to buy at Portia shop when he noticed that she was a hunter, and he also saw that she ordered most of her book from the online shop. He had seen foreseen the demons walking the earth.
Being a warlock meant that he was half a demon and half-human.