Shirley Temple portrays Sara, the pampered daughter of a British officer. Left in a boarding school when her father goes off to war, her world is turned upside down when he is reported dead. Destitute, Sara is made a servant at the school, yet she refuses to let her spirit be broken.

Year three at Hogwarts means new fun and challenges as Harry learns the delicate art of approaching a Hippogriff, transforming shape-shifting Boggarts into hilarity and even turning back time. But the term also brings danger: soul-sucking Dementors hover over the school, an ally of the accursed He-Who-Cannot-Be-Named lurks within the castle walls, and fearsome wizard Sirius Black escapes Azkaban.