The "Cairo Trilogy" is a famous series of three novels written by Egyptian author Naguib Mahfouz. It includes "Palace Walk," "Palace of Desire," and "Sugar Street," and it explores the lives of a middle-class family in Cairo during the early 20th century. The story delves into themes of love, politics, and social change, reflecting the complexities of Egyptian society. The trilogy follows the patriarch Al-Sayyid Ahmad Abd al-Jawad and his family, showcasing their struggles and aspirations. Through rich character development and vivid storytelling, Mahfouz captures the essence of life in Cairo, making the trilogy a significant work in world literature.