"The Wingfeather Saga" is a fantasy book series written by Andrew Peterson. It follows the adventures of the Igiby family, particularly three siblings: Janner, Tink, and Leeli. Set in the fictional land of Aerwiar, the story combines elements of adventure, humor, and heart as the children discover their heritage and face various challenges, including the menacing Fangs of Dang. The series consists of four main books: "On the Edge of the Dark Sea of Darkness," "North! Or Be Eaten," "The Monster in the Hollows," and "The Warden and the Wolf King." It explores themes of family, bravery, and the struggle between good and evil, appealing to both children and adults.