Harry Potter and the Half-blood Prince

Harry has yet again spent the summer holidays at the Dursleys'. He has had plenty to think about, though - from the death of his beloved godfather Sirius Black, to the terrifying chase through the Ministry of Magic by the Death Eaters, to the fierce duel he witnessed between Professor Dumbledore and Lord Voldemort.
It is the middle of the summer, but there is an unseasonal mist pressing against the windowpanes. Harry is waiting nervously for a visit from Professor Dumbledore himself. He can't quite believe that Professor Dumbledore will actually appear at the Dursleys' of all places.
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
J.K. Rowling charts Harry Potter's adventures in his sixth year at Hogwarts with a mix of detail and humour that is unsurpassed, pace that is breathless and above all a flair that is magical.