Ah! The perfect book for me to read right now as I await my trip to Japan right after Halloween! Nice how the POV is the ghost, and definitely kept my interest. NOW I can read book two, as I had accidentally started with that and was kinda confused for a while.
Oh yeah! I was also going to add that this book was a very good teen readalike for Dexter! With the main character being a vengeful ghost and all, it felt a lot like Dexter (if Dexter was a vengeful, Japanese, ghost) what with killing child murderers.