- As Harry Potter begins his sixth year at Hogwarts, he discovers an old book marked as "the property of the Half-Blood Prince" and begins to learn more about Lord Voldemort's dark past.
- During Harry Potter's sixth year at Hogwarts, he finds a book that once belonged to the mysterious Half-Blood Prince that earns him the respect of his new Potions professor Horace Slughorn. In addition, Dumbledore must prepare Harry for the ultimate final confrontation by finding out the secret behind Voldemort's power. Meanwhile, a hidden enemy waits in the shadows to carry out a mission given to him by the Dark Lord.—Blazer346
- As the sixth year at Hogwarts begins, both worlds are more in danger by the ultimate evil threat. Harry begins to learn more about the past of the evil threat as he tries to discover the true identity of a title name that he finds within the school.—RECB3
- Lord Voldemort tightens his grip on the wizarding and Muggle worlds: his Death Eaters kidnap Mr Ollivander and destroy London's Millennium Bridge. With Lucius Malfoy incarcerated in Azkaban, Voldemort chooses his son, Draco Malfoy, to carry out a secret mission at Hogwarts. Draco's mother, Narcissa, and aunt Bellatrix Lestrange seek out Severus Snape, who gains their confidence by claiming he is a mole within the Order of the Phoenix. Snape makes an Unbreakable Vow with Narcissa to protect Draco and fulfil his task should he fail. Harry Potter accompanies Albus Dumbledore to persuade former Potions professor Horace Slughorn to return to Hogwarts. Then, at the Burrow, Harry reunites with his best friends Ron and Hermione. In Diagon Alley, they see Draco and Narcissa Malfoy, and follow them into Knockturn Alley. The pair meet with Death Eaters, including the werewolf Fenrir Greyback, at Borgin & Burke's. Harry believes Draco is now a Death Eater, but Ron and Hermione are sceptical. On the Hogwarts Express, Harry sneaks into the Slytherin carriage wearing his Invisibility Cloak to spy on Malfoy. Malfoy notices and petrifies Harry, leaving him on the train. Luna Lovegood finds him and counters Draco's spell. Harry discovers that his used Potions textbook is filled with helpful notes and spells added by the "Half-Blood Prince". Using it, Harry excels in class, annoying Hermione and impressing Slughorn, who awards him a Liquid Luck potion. Ron makes the Gryffindor Quidditch team as Keeper and begins dating Lavender Brown, upsetting Hermione, who harbours feelings for him. Harry consoles Hermione while acknowledging his own feelings for Ginny Weasley. Harry spends the Christmas holidays with the Weasleys. His suspicions about Draco are dismissed by the Order, but Arthur Weasley reveals that the Malfoys may be interested in a Vanishing Cabinet at Borgin & Burke's. Bellatrix and Greyback attack and destroy the Burrow. At Hogwarts, Dumbledore asks Harry to retrieve Slughorn's memory of a young Voldemort. Slughorn has resisted giving an accurate memory. After Ron accidentally ingests a love potion intended for Harry, Harry takes him to Slughorn for a cure. After curing Ron, Slughorn offers both boys some mead he had intended as a gift to Dumbledore. Ron is poisoned upon sipping it, and Harry's quick thinking saves him. While recovering in the infirmary, Ron murmurs Hermione's name, causing Lavender to end their relationship. Harry confronts Draco about the poisoned mead and also a cursed necklace that nearly killed Katie Bell. A duel erupts, and Harry uses one of the Half-Blood Prince's curses without knowing what it is. The curse severely injures Malfoy, and he is only saved by Snape's timely arrival and reversal of the curse. Fearing the book contains Dark Magic, Ginny persuades Harry to hide it in the Room of Requirement. They then share their first kiss. In Hagrid's hut, Harry uses his Liquid Luck potion to convince the reluctant Slughorn to surrender the memory Dumbledore needs. Viewing it in the Pensieve, Dumbledore and Harry learn Voldemort sought information about Horcruxes, magical objects containing pieces of a wizard's soul for immortality. Dumbledore surmises Voldemort divided his soul into six Horcruxes, two of which have been destroyed: Tom Riddle's diary and Marvolo Gaunt's ring. They travel to a cave where Harry aids Dumbledore in drinking a potion that hides another Horcrux, Slytherin's locket. A weakened Dumbledore defends them from Inferi by creating a ring of fire, and apparates them back to Hogwarts, where Bellatrix, Greyback, and other Death Eaters have entered through the Vanishing Cabinet in the Room of Requirement that Draco has secretly connected to one in Knockturn Alley. As Harry hides, Draco appears and disarms the headmaster, revealing Voldemort chose him to kill Dumbledore. Draco hesitates; Snape, however, arrives and kills Dumbledore. As the Death Eaters escape, Snape reveals to Harry that he is the Half-Blood Prince. As Hogwarts students and staff mourn Dumbledore's death, Harry tells Ron and Hermione that the locket is fake and contains a message from "R.A.B.", who stole the real Horcrux intending to destroy it. Harry, Ron and Hermione agree to forgo their final Hogwarts year to hunt for the remaining Horcruxes.
- In Harry Potter's (Daniel Radcliffe's) sixth year at Hogwarts School of Witchcraft, he finds a book marked mysteriously, "This book is the property of the Half Blood Prince", which helps him excel at Potions class and teaches him a few dark and dangerous ones along the way. Meanwhile, Harry is taking private lessons with Dumbledore (Sir Michael Gambon) in order to find out about Voldemort's (Ralph Fiennes') past so they can find out what might be his only weakness.—heather
- Scarred by his experience at the Ministry of Magic with Voldemort, Harry is reluctant to return to Hogwarts. Dumbledore encourages him to continue, after transporting him to see a former professor, Horace Slughorn, hoping that Slughorn would return to Hogwarts and take Harry under his wing.
Meanwhile, Death Eaters begin to wreak havoc both towards Muggles, destroying the Millennium Bridge, and Wizards, kidnapping the wandmaker Mr. Ollivander and destroying his Diagon Alley shop. Bellatrix Lestrange entreats Severus Snape to enter an Unbreakable Vow with Draco Malfoy's mother, Narcissa, assuring that he will complete the task assigned to Draco should Draco fail and that he will protect him and make sure he doesn't get hurt. Harry, Ron and Hermione, while in Diagon Alley, spot Draco entering Borgin and Burkes and taking part in a ritual with other Death Eaters, and become suspicious of his actions.
At Hogwarts, the school is under tight security to prevent the Death Eaters from entering the school. With Slughorn back to teach Potions, Snape is given Defense Against the Dark Arts. Harry and Ron are encouraged by Professor McGonagall to take up Potions now that Slughorn, with lower standards, is teaching the class; however, as neither was expecting to take the course, they have to find textbooks for themselves in the bookcase. Harry's book is annotated with more exact instructions to complete potions, giving him an edge over the other students; he finds that it once belonged to the "Half-Blood Prince", a term Hermione cannot figure out. Meanwhile, Ron becomes the successful Gryffindor's Quidditch goalie, attracting the love of Lavender Brown, much to Hermione's chagrin. Harry is also upset over Ginny's attraction to Dean Thomas. During the Christmas Break while Harry and Ron are at the Burrow, the Death Eaters with Bellatrix in charge come intending to kidnap Harry, but are forced to retreat after they are outnumbered by Order of the Phoenix members. Before they leave they set fire to the Burrow, and the Weasleys are gathered outside the house, leaving Harry regretting the evil that he has brought down upon people he cares about.
Dumbledore reveals to Harry through the Pensieve memories of Tom Riddle (Voldemort's original name), including a false memory from Slughorn, when Riddle asked him about a certain restricted Dark Art. The memory fails to reveal this art, and Dumbledore believes that the key to defeating Voldemort is to learn what Dark Art Riddle asked about, and instructs Harry to further confide himself to Slughorn. Using a Luck potion he won earlier in the school year, Harry is able to bring Slughorn to be intoxicated with Hagrid and convinces the professor in his stupor to give him the true memory. This memory reveals that Riddle inquired about the creation of Horcruxes, devices that store a portion of the creator's soul to allow them to live indefinitely. Dumbledore reveals that Riddle's diary and his mother's ring were two of seven Horcruxes that Riddle had created, and that they must track these down and destroy them to make Voldemort mortal.
Meanwhile, Harry continues to be suspicious of Draco's actions, following him around the school but no success in determining what he seeks. Harry believes Draco to be behind two indirect attempts on Dumbledore's life, one through a cursed necklace that Katie Bell, under an Imperius Curse, was bringing to Dumbledore as a gift, and another through a bottle of poisoned wine that Slughorn, similarly cursed, planned to give to the professor. The latter is discovered accidently when Ron ingests the poison; though he recovers with medical treatment, he unconsciously mumbles Hermione's name in front of Lavender, sending her away crying. After this incident, Harry corners Draco in the toilets and after a short fight casts the Sectumsempra curse from the Half-Blood Prince's book, severely harming Draco. Snape arrives knowing that he let Draco get hurt and that he broke one of the promises and heals him. Ginny convinces Harry to hide the book in the Room of Requirement to prevent him from using it again; there, they discover, unknown to them, a Vanishing Cabinet, which Draco has been attempting to repair, but think nothing of it further. Ginny also reveals her love for Harry, and they kiss after she hides the book.
Dumbledore implores Harry to help him recover another Horcrux, the location of which he recently learned. The two transport themselves to a seaside cliff, and enter a cave where the Horcrux is located. On a small crystalline island, Dumbledore forces Harry to make him drink a mind-altering liquid in order to reveal the Horcrux. While Dumbledore recovers from the liquid, Harry recovers the Horcrux, a small pendant. Harry tries to help Dumbledore recover, but they are attacked by numerous inferi. Dumbledore recovers in time to set them aflame, and the two return to the Astronomy Tower at Hogwarts.
Dumbledore, still weakened by the trial, instructs Harry to go to get Snape. However, before Harry can go, footsteps are heard, and Dumbledore tells Harry to hide on the lower floor. The footsteps belong to Draco, who prepares to kill Dumbledore, but cannot bring himself to do so. Meanwhile, with the Vanishing Cabinet fixed, Bellatrix and other Death Eaters are able to invade Hogwarts through a similar cabinet at Borgin and Burkes, and join Draco in the tower. Snape silently arrives on the lower floor, indicating to Harry to stay quiet, and then goes upstairs, joining the other Death Eaters. Snape then casts the killing spell Avada Kedavra on Dumbledore, throwing him over the side of the Tower and killing him. Snape, Draco, and the other Death Eaters depart the school, Bellatrix casting the Death Eaters' sign over the school, destroying the Great Hall and setting fire to Hagrid's hut in glee. Harry tries to stop them with the Sectumsempra spell, but Snape deflects it and stuns him. As he departs, he explains to Harry that he is the Half-Blood Prince and the creator of the spell.
Harry returns to the school to find the staff and students mourning over Dumbledore's death. Harry walks over to Dumbledore's body lying in front of them, grieving as Ginny comforts him. When he returns to the late headmaster's office one last time, McGonagall confronts him and asks him to open up to her, but he does not comply and leaves. A portrait of Dumbledore can be seen hanging on a wall behind them.
Harry reveals to Ron and Hermione that the Horcrux they got was a fake, containing a message from an "R.A.B." that stated he had already taken it, but is also seeking to end Voldemort's life. Harry tells his friends that he does not plan to return next year, instead seeking out R.A.B. and the other Horcruxes so that he may put an end to Voldemort; Ron and Hermione remind Harry that they are his friends and will help alongside him in his goal.
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