Here are another couple of books I had reserved for Halloween: The Last Apprentice: Curse of the Bane, and The Last Apprentice: Night of the Soul Stealer, books 2 and 3 of The Wardstone Chronicles by Joseph Delaney.
I discovered this series by chance — I randomly got it off Bookmooch a couple of years ago (mainly because and read it for Halloween last year. I liked the first book so much, and as luck would have it, the series is available here (P289 each at National Book Store!) so I immediately put the next two books on my Christmas wishlist last year, and got them via the Flips Flipping Pages Kris Kringle. And here came Halloween again, so I broke out books 2 and 3!