Sara is sent to a strict boarding school after her father enlists in WWI. When he is presumed dead, the headmistress, knowing she will not receive any more money, forces the girl to become a servant.

Harry Potter, Ron and Hermione return to Hogwarts School of Witchcraft and Wizardry for their third year of study, where they delve into the mystery surrounding an escaped prisoner who poses a dangerous threat to the young wizard.