Once I started this book, I couldn't put it down! I even read it when I should have been working.... My only complaint about Prisoner of Heaven is that it's so short. Well, that and(show spoiler)
Now that I've read all the books in this series, I want to go re-read them all. Ruiz Zafon has created a rich, intricate storyline with complex, three-dimensional characters that really draw the reader in. He is a very skilled writer. The Cemetery of Forgotten Books is now tied for first as my favorite book series.