the Wee Free Men

They're small. They're blue.
And nobody messes with them.

Armed with only a frying pan and her common sense, young witch-to-be Tiffany Aching must defend her home against the very monsters of Fairyland. Luckily, she has some very unusual help: the local Nac Mac Feegle -- aka the Wee Free Men -- a clan of fierce, sheep-stealing, sword-wielding, six-inch-high blue men.

Together they must face headless horsemen, ferocious grimhounds, terrifying dreams come true, and ultimately the sinister Queen of the Elves herself.... 

Author: Terry Pratchett 

Publisher: HarperCollins

Released Date: 2003

ISBN: 9780060012366