Returning for his fifth year of study at the venerable Hogwarts School of Witchcraft and Wizardry, the ever-maturing Harry Potter (Daniel Radcliffe) is stunned to find that his warnings about the return of Lord Voldemort (Ralph Fiennes) have been ignored. Left with no choice, Harry takes matters into his own hands, training a small group of students -- dubbed "Dumbledore's Army" -- to defend themselves against the dark arts.