The Wee Free Men
The Wee Free Men is the 30th in the Discworld book series by Terry Pratchett. It was published in 2003. It is the second Discworld book written for children, but it's still liked by many adults.
Plot
The Queen of the Elves tries to invade the Discworld again by stealing children and invading dreams. Tiffany Aching, a 9-year-old girl discovers that her grandmother used to be a witch. Tiffany also discovered that she has a talent for magic, too. When Tiffany's baby brother is stolen by the evil queen, Tiffany enters the elves' world to save him with the help of "The Wee Free Men" and Miss Tick. "The Wee Free Men" are small blue fairies and they speak with a Scottish accent.