When Dumbledore arrives at Privet Drive one summer night to collect Harry Potter, his wand hand is blackened and shrivelled, but he will not reveal why. Rumours and suspicion spread through the wizarding world, and Harry is convinced that Draco Malfoy bears the Dark Mark: there is a Death Eater amongst them. Harry will need powerful magic and true friends as, with the help of Dumbledore, he investigates Voldemort's darkest secrets.