The people of Gubbio, threatened by a hungry, howling wolf, are trapped inside the walls of their city. Francis, the 12th-century Italian saint, who has given away all that he had, comes to address the beast. Francis secures its promise that if the town will feed the wolf, they will not have to fear for their children or their livestock. Langton, a fine and venerable writer for children and adults, couches the familiar story in clear cadences. Plume’s illustrations are exquisite: A framed image in dry pure colors faces each page of text in a lovely, readable font. A grace note—flowers, fruit, vines—at the bottom of each page of text reflects a motif of the facing image. Francis’s “Canticle of the Sun” fills the endpapers, surrounded by flowers and small creatures. About as different in form and feeling from Michael Bedard’s The Wolf of Gubbio (2000) as can be imagined, but captures the same luminous, sweet essence of the tale. (Nonfiction. 6-10)