On the eve of his final battle, an aging King Arthur retreats to the company of his mentor, Merlyn, to confront the futility of war and the nature of human governance. As the king faces the inevitable collapse of his kingdom, he is transported into the animal kingdom to observe the stark differences between the social structures of ants and geese. Through these surreal encounters, Arthur must reconcile his youthful ideals with the harsh realities of his reign. The narrative employs a blend of philosophical dialogue and fable-like sequences to examine the moral weight of leadership.

This work is widely regarded as the definitive conclusion to the author's Arthurian cycle, providing a thematic resolution that the earlier volumes lacked. Critics have noted that the book functions as a poignant, if occasionally didactic, meditation on the pacifist ideals the author held during the later years of his life. Readers often appreciate the return to the whimsical, magical tone found in the earlier books, even as the subject matter shifts toward somber political inquiry. The text serves as a final testament to the author's vision of a rounded and complete epic, cementing its place in the broader canon of twentieth-century fantasy literature.