Elf Girl and Raven Boy Book 5: Terror Town - Marcus Sedgwick
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Terror Town is trouble with a capital T. What will happen to our intrepid trio (that includes Rat) when the Tears of the Moon are taken, and Terrible Tim and the Trolls are on their trail? There are tempers (Elf Girl's), tests (for Raven Boy), tunes (the Singing Sword's), oh and zombies, with a capital Z, too.