Harry Potter and the Half-Blood Prince - J.K. Rowling

This was, believe it or not, the first Harry Potter book that had me crying. I still have a bumper sticker that I got the morning of the book 7 release - you had to choose from one that said "Trust Snape" and one that I can't remember what it said - I had to choose "Trust Snape," myself, but I am a trusting person, I guess. But  it was hard to be trusting after this book, I can't lie. After reading book 7, there are things that make me really sad to think about with Snape from book 5 and book 6. It's been really good to reread this series in a relatively short period of time, actually, I am really glad I did the Hogwarts Challenge!