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.

Sirius was killed during the Battle of the Department of Mysteries, where his cousin, death eater Bellatrix Lestrange ... original member. Harry Potter and the Half-Blood Prince revealed that ...

And Lupin's relationship with Harry's father, James, eventually brought Harry and Lupin closer. Lupin and Tonks developed a relationship during Harry Potter and the Half-Blood Prince, and Tonks ...

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.