This is so much fun. Think Buffy, except that she's a zombie.
I was originally attracted to this because I thought she would be a cyber-zombie ("i" connotes technology to me), but be warned, she's not. There are ghosts, vampires, a wereterrier, a mummy, and of course, a mystery. You don't know quite who to trust. But this is clearly an establishing volume for a much larger story.
And I think I'll read the rest.
At first glance, I wasn't a big fan of the illustrations, but they really do serve the story well, and/or the story really is that strong so that you're sucked into it and don't notice the illustrations.