Discworld The Wee Free Men A Discworld Novel #30 Terry Pratchett 2004
A nightmarish danger threatens from the hills. Armed with only a frying pan and her common sense, young Tiffany Aching must defend her home against the monsters of Fairyland.
Luckily she has some very unusual help: the local Nac Mac Feegle - aka the Wee Free Men.