Harry, Ron and Hermione have returned to Hogwarts School of Witchcraft and Wizardry for their second year. (But they only just made it - they missed the Hogwarts Express and had to get a flying car!) Soon the threesome are immersed in the daily round of Potions, Herbology, Charms, Defence Against the Dark Arts and Quidditch. But then horrible things start happening. Harry hears evil voices. Sinister messages appear on the wall. But nothing can prepare them for what happens next...