Another review and great pic to boot!:
Terror Town by Marcus Sedgewick.
“Terror Town is a fantastic book which I recommend to every kid my age. Raven Boy and Elf Girl are the two main characters who go on adventures and try to defeat the Evil Goblin King. In Terror Town they have to face Werewolves, Zombies and Terrible Tim. This book is followed by Creepy Caves and is the best series ever even beating Harry Potter.
I really really like the character Raven Boy and dressed up as him for Book week, even with Feathers in my hair.” (J.S. aged 9) http://ow.ly/i/cESab