Title: Harry Potter and the Half-Blood Prince
Author: J.K. Rowling
Harry's sixth year began with the return of a retired professor Horace Slughorn, to teach Potion again in Hogwarts. This, along with a book belonged to "the Half-Blood Prince", changed Harry's luck in the subject, in which he previously suffered a lot during his five years with Professor Snape.
From the memory of Professor Slughorn, Harry learned that Voldemort had used something called "Horcrux" to make himself immortal. Therefore, to defeat Voldemort, Harry must find and destroy all of the Horcruxes hidden in various dangerous places.
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