The "Book of the New Sun" is a four-volume science fantasy series written by Gene Wolfe. It follows the journey of Severian, a young apprentice in a guild of torturers, as he navigates a distant future where the sun is dying. The narrative blends elements of mythology, philosophy, and intricate world-building, creating a rich tapestry of themes and ideas. The series is known for its complex prose and unreliable narration, challenging readers to engage deeply with the text. It explores concepts of memory, identity, and the nature of power, making it a significant work in the genre of speculative fiction.