Derek Landy is a genius! This is SUCH a great book! I read the whole thing in about five hours on a trip to visit my sister, and it was incredibly awesome. The ending is also open enough for a sequel, which I HOPE happens.
Anyway, this book is about a girl (Stephanie Edgley) who gets swept away by inhabitants of a world nobody knows exists. While the premise is pretty straightforward and almost overused in YA fantasy, the way in which the details of that alternate reality are fresh, exciting and fully rendered. Skullduggery Pleasant is a walking, talking skeleton who takes it upon himself to guard Stephanie after her uncle dies. What ensues is dry humor and dark comedy at its best. Skullduggery is wry and a tad jaded after all his years on earth.
If you like film noir on the lighter side, this book is a must-read! Oh, and you can find out more about the characters and their hobbies at the official website: http://www.skulduggerypleasant.com/us/