"A Hat Full of Sky" is a young adult fantasy novel by Terry Pratchett. The story follows Tiffany Aching, a young witch who leaves her home in the Chalk to become an apprentice to Miss Level in the big city. Tiffany quickly learns that being a witch is not just about casting spells, but also about understanding people and the world around her. She must also confront a dangerous creature known as a hiver, which seeks to take over her mind and use her powers for its own purposes. With the help of her friends and fellow witches, Tiffany must learn to control her magic and defeat the hiver before it's too late.

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