My rating: 5 of 5 stars
I actually finished reading it last night, but am only just writing the review now. I'm giving this 5 stars due to the humour and shocks throughout the book. I thought the second book (Hollow City) was great already, but the third book is amazing. Absolutely hard to put down, and truth be told, I had more than one 'aww' moment.
I wished this wasn't the end of the trilogy, but I think Riggs stopped at just the right time. Rather than drag a story out just because it was received well and eventually becoming boring, I think the Library of Souls ended at just the right note.