It is the summer holidays and soon Harry Potter will be starting his fourth year at Hogwarts School of Witchcraft and Wizardry. Harry is counting the days: there are new spells to be learnt, more Quidditch to be played, and Hogwarts castle to continue exploring. But Harry needs to be careful - there are unexpected dangers lurking. J.K. Rowling continues to surprise and delight with the power of her rich, demanding and action-packed storytelling.