The sixth book in the Harry Potter series:
Harry Potter's sixth year at Hogwarts School of Witchcraft and Wizardry is about to begin as a war rages between the wizarding world and Lord Voldemort. Despite the building anxiety of students and faculty alike, life continues in some semblance of normal. In the midst of love, unease, and schoolwork, Harry gains the help of the elusive Half-Blood Prince...
J.K. Rowling - Harry Potter and the Half-Blood Prince
Hardcover and Paperback