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. And Harry will confront them all.

Paul (Macfadyen), a prize-winning war journalist, returns to his remote New Zealand hometown due to the death of his father, battle-scarred and world-weary. For the discontented sixteen-year-old Celia (Barclay) he opens up a world she has only dreamed of. She actively pursues a friendship with him, fascinated by his cynicism and experience of the world beyond her small-town existence. But many, including the members of both their families (Otto, Moy), frown upon the friendship and when Celia goes missing, Paul becomes the increasingly loathed and persecuted prime suspect in her disappearance. As the violent and urgent truth gradually emerges, Paul is forced to confront the family tragedy and betrayal that he ran from as a youth, and to face the grievous consequences of silence and secrecy that has surrounded his entire adult life.