Set on an idyllic Greek island, the plot serves as a background for a wealth of ABBA hit songs. Donna, an independent, single mother who owns a small hotel on the island is about to let go of Sophie, the spirited young daughter she's raised alone. But Sophie has secretly invited three of her mother's ex-lovers in the hopes of finding her father.
Returning for his fifth year of study at the venerable Hogwarts School of Witchcraft and Wizardry, the ever-maturing Harry Potter is stunned to find that his warnings about the return of Lord Voldemort 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.