The Half Blood Prince.

Before I started reading, my friend told me that this is the best of all. For me the Goblet of Fire was the best. I finished reading the book yesterday and for me the Goblet of Fire still remains the best. (The worst is the Order of the Phoenix).

I was a bit of a rude jolt to see Dumbledore dying. The seven Horcruxes of Voldemort, well Rowling must have got the inspiration from some Vittalacharya movie.