In Harry Potter and the Half-Blood Prince, Lord Voldemort tightens his grip on both the wizarding and Muggle worlds. As danger creeps into Hogwarts, Headmaster Dumbledore prepares Harry for the looming final battle by exploring the Dark Lord's past. Meanwhile, teenage romance and jealousy sweep through the castle, and Draco Malfoy undertakes a secret, sinister mission.Plot SummaryThe Hunt for Memories: Dumbledore recruits an old friend, Professor Horace Slughorn, to return to Hogwarts as the Potions master. Harry and Dumbledore delve into Slughorn's memories to uncover the secret of Voldemort's immortality: his creation of Horcruxes.The Half-Blood Prince: While struggling in Potions, Harry finds an old, annotated textbook once belonging to the mysterious "Half-Blood Prince." The notes and advanced spells inside help Harry excel in class and impress Slughorn, but they also contain dangerous dark magic.Draco’s Secret Mission: Harry suspects Draco Malfoy has become a Death Eater and is working on a deadly assignment from Voldemort within the school.The Climax: Harry and Dumbledore venture to a hidden cave to retrieve a Horcrux. Upon their return, Draco manages to sneak Death Eaters into Hogwarts. Disarmed by Draco, Dumbledore is ultimately killed by Professor Severus Snape, who reveals himself as the Half-Blood Prince before escaping.