The Horcruxes
People who read Harry potter should know by now what a Horcrux is.
Voldermort (I am like Albus and Harry, courageous to spell out his name!) is supposed to have about 7 horcruxes of himself hidden in several places. Author JKR has given some hints about where each of those horcruxes are, though she has not told exactly where it is - and thats the story of the 7 th book.
Riddler's diary
The ring
The locket
The lamp
Voldermort himself.
These are the so far known horcruxes. There is one horcrux that is still not coming into account and I have a feeling there are sightings about it in the past books.
Book -1, Harry Potter and the Sorceror's stone:
"Perhaps Harry had eaten a bit too much, because he had a very strange dream. He was wearing Professor Quirrell's turban, which kept talking to him, telling him he must transfer to Slytherin at once, because it was his destiny. Harry told the turban he didn't want to be in Slytherin; it got heavier and heavier; he tried to pull it off but it tightened painfully -- and there was Malfoy, laughing at him as he struggled with it -then Malfoy turned into the hook-nosed teacher, Snape, whose laugh became high and cold -- there was a burst of green light and Harry woke, sweating and shaking.
He rolled over and fell asleep again, and when he woke next day, he didn't remember the dream at all."
All these evidences indicate that Harry Potter himself could be the Seventh Horcrux. Precisely the thunderbolt mark left by Voldermort when he tried to kill Harry when he was child will be the seventh horcrux. The prophecy also seem to suggest the same - "niether can live while the other survives". So my guess is that 7th book will NOT only be the last book, but also will be the book where JKR is going to say goodbye to Harry himself. This could be something hard to accept by many of Harry's fans, but I think this is a reasonable ending for the book - given the circumstances.


