"Alanna of Trebond" is the first book in the Song of the Lioness series by Tamora Pierce. It follows the story of Alanna, a young girl who disguises herself as a boy to train as a knight in the kingdom of Trebond. She faces various challenges as she navigates her dual identity while pursuing her dream of becoming a warrior. Throughout her journey, Alanna develops strong friendships and learns valuable lessons about courage, loyalty, and self-discovery. The book explores themes of gender roles and empowerment, making it a significant work in the young adult fantasy genre.