Lord Voldemort’s dominion tightens its grip on both the wizarding and Muggle worlds. His Death Eaters undertake audacious acts, such as the kidnapping of Mr. Ollivander and the destruction of London’s Millennium Bridge. With Lucius Malfoy imprisoned in Azkaban, Voldemort selects his son, Draco Malfoy, to carry out a secretive mission at Hogwarts. Draco’s mother, Narcissa, and his aunt Bellatrix Lestrange seek out Severus Snape, who gains their trust by feigning allegiance to the Order of the Phoenix. Snape enters an Unbreakable Vow with Narcissa, pledging to safeguard Draco and fulfill his mission should Draco falter.
Harry Potter accompanies Albus Dumbledore on a mission to convince former Potions professor Horace Slughorn to return to Hogwarts. Afterward, at the Burrow, Harry reunites with his closest friends, Ron and Hermione. During a visit to Diagon Alley, they encounter Draco and Narcissa Malfoy and decide to follow them into Knockturn Alley. The pair engages with Death Eaters, including the menacing werewolf Fenrir Greyback, at Borgin & Burke’s. Harry suspects Draco’s involvement with the Death Eaters, but Ron and Hermione remain skeptical. On the Hogwarts Express, Harry sneaks into the Slytherin carriage under his Invisibility Cloak to spy on Malfoy. However, Draco detects his presence and petrifies Harry, leaving him aboard the train. Luna Lovegood eventually finds Harry and counteracts Draco’s spell.
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Harry soon realizes that his secondhand Potions textbook is filled with helpful notes and spells left by the mysterious “Half-Blood Prince.” Utilizing this resource, Harry excels in his Potions class, much to Hermione’s frustration and Slughorn’s admiration, who rewards him with a dose of Liquid Luck. Ron becomes the Keeper for the Gryffindor Quidditch team and enters a romantic relationship with Lavender Brown, which deeply upsets Hermione, who secretly harbors feelings for Ron. Harry and Hermione both come to terms with their romantic feelings, and Harry spends the Christmas holidays with the Weasley family. His concerns about Draco’s activities are dismissed by the Order, but Arthur Weasley reveals that the Malfoys might be interested in a Vanishing Cabinet at Borgin & Burke’s. Bellatrix and Greyback subsequently attack and wreak havoc at the Burrow.
Back at Hogwarts, Dumbledore tasks Harry with obtaining Slughorn’s memory, which holds vital information about a young Voldemort. Slughorn, however, has been evading providing this memory. After Ron accidentally consumes a love potion intended for Harry, he becomes seriously ill and is taken to Slughorn for treatment. Slughorn offers them mead, which he had meant as a gift for Dumbledore. Ron sips it and is poisoned, but Harry’s quick thinking saves him. While recovering in the infirmary, Ron unconsciously utters Hermione’s name, causing Lavender to break up with him. Harry confronts Draco about the poisoned mead and a cursed necklace that nearly killed Katie Bell. A duel erupts, and Harry unknowingly uses one of the Half-Blood Prince’s spells, severely injuring Malfoy. Snape arrives in the nick of time to reverse the curse and save Draco. Fearing that the textbook may contain Dark Magic, Ginny persuades Harry to hide it in the Room of Requirement. They also share their first kiss.
In Hagrid’s hut, Harry uses his Liquid Luck potion to persuade the reluctant Slughorn to provide the memory that Dumbledore needs. Viewing it in the Pensieve, Dumbledore and Harry discover that Voldemort sought information about Horcruxes, enchanted objects containing fragments of a wizard’s soul for the purpose of achieving immortality. Dumbledore surmises that Voldemort divided his soul into six Horcruxes, and two have already been destroyed: Tom Riddle’s diary and Marvolo Gaunt’s ring. They embark on a journey to a cave where Harry helps Dumbledore consume a potion that hides another Horcrux, Slytherin’s locket.
Dumbledore, weakened by the potion, protects them from Inferi by creating a ring of fire. He then apparates them back to Hogwarts, where Bellatrix, Greyback, and other Death Eaters have entered through the Vanishing Cabinet that Draco secretly connected to one in Knockturn Alley. Harry hides, and Draco appears to disarm the headmaster, revealing that Voldemort has chosen him to kill Dumbledore. However, Draco hesitates, and Snape arrives to carry out the deed. Dumbledore is killed by Snape during the escape of the Death Eaters. Before departing, Snape reveals to Harry that he is the Half-Blood Prince.
As the students and staff at Hogwarts grieve Dumbledore’s death, Harry confides in Ron and Hermione about the locket being a fake, containing only a message from “R.A.B.” who had stolen the real Horcrux with the intention of destroying it. Harry, Ron, and Hermione decide to forgo their final year at Hogwarts to embark on a quest to locate and destroy the remaining Horcruxes.