The games follows Harry Potter along with Ron Weasley and Hermione Granger as they return to Hogwarts School of Witchcraft and Wizardry. Prisoner Sirius Black has escaped the wizard prison Azkaban, and is supposedly ready to attack Harry in Hogwarts. The game begins on the Hogwarts Express, ignoring the events at Harry's home. Upon reaching Hogwarts, the trio follow the events of the novel, and learn magic by attending classes.