"Bud, Not Buddy" is a historical fiction novel by Christopher Paul Curtis set during the Great Depression. It follows the journey of a ten-year-old boy named Bud Caldwell, who is an orphan living in Michigan. After escaping from a foster home, Bud embarks on a quest to find his father, whom he believes is a famous jazz musician. Throughout his adventure, Bud encounters various challenges and meets different characters, including Herman E. Calloway, who he thinks might be his father. The story highlights themes of family, resilience, and the importance of music in shaping identity and community.