The Wee Free Men by Terry Pratchett
In this humorous fantasy novel, a young witch named Tiffany Aching embarks on a quest to rescue her kidnapped brother, armed only with a frying pan and the assistance of the Nac Mac Feegle—a clan of rowdy, blue-skinned, six-inch-tall pictsies. As Tiffany ventures into the realm of Fairyland, she must rely on her wits, courage, and newfound magical abilities to navigate a world filled with dreams and nightmares, where nothing is as it seems. Along the way, she learns valuable lessons about responsibility, the power of knowledge, and the importance of standing up for oneself and others.