"The Complaint Book" is a collection of letters and writings by Khaled Hosseini, an Afghan-American author known for his poignant storytelling. The book highlights the struggles and challenges faced by individuals in Afghanistan, particularly during times of conflict and upheaval. Through personal narratives, the book sheds light on the human experience, emphasizing themes of resilience, hope, and the quest for justice. It serves as a powerful reminder of the importance of voicing grievances and seeking change in society, making it a significant contribution to contemporary literature.