It is the middle of summer, and there is an unseasonal mist pressing against the windowpanes. Harry Potter is waiting nervously in his bedroom at the Dursleys' house in Privet Drive for a visit from Professor Dumbledore himself. One of the last times he saw the Headmaster was in a fierce one-to-one duel with Lord Voldemort. Why is the Professor coming to visit him now? What is it that cannot wait until Harry returns to Hogwarts in a few weeks' time? Harry's sixth year at Hogwarts has already got off to an unusual start, as the worlds of Muggle and magic start to intertwine...