The Wee Free Men - Terry Pratchett - Bog

There's trouble on the Aching farm: monsters in the river, headless horsemen in the lane?and Tiffany Aching's little brother has been stolen by the Queen of Fairies. Getting him back will require all of Tiffany's strength and determination (as well as a sturdy skillet) and the help of the rowdy clan of fightin', stealin', tiny blue-skinned pictsies known as the Wee Free Men!