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.
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Rupert Grint
Emma Watson
Michael Gambon
Jim Broadbent
Tom Felton