The Shadow of the Wind

To this point in the book, Daniel, a young boy, heads over to a cemetery of books, where books are left behind, but where each book has a spirit behind it. Daniel is taken to the cemetery after he is found crying because of the death of his mother, his dad takes him to the cemetery and explains to him that he may take one book. When he receives the book, Daniel finds it to be very thought provoking, and very enchanting. Being curious, he decides to ask his father about the title, and the author. When the father revises the book, he notices that it is a book he has never heard of, and as well an author that he has never heard of. They both decide to take it to a wise book store owner, the owner finds the book so interesting that he wants to buy it from him. Out of the same curiosity as the book store owner, Daniel decides to not sell it, but decide that they would keep further investigation. It seems like the book is a mystery it self, but has the mystery of the book brought Daniel to any danger such as people persecuting him for his book? Why has the author or the book kept such a secret that not even the wisest man of books cannot figure out who or what it is?