half-blood prince.

This book is Harry find out the thing of the Voldmort.
Harry and Dumbledore are go to the cave that Voldmort hidden his horcrux.
Horcrux is dark magic.
And Harry find that thing and destoryed.

In this book, is Harry find out the thing of the Lord Voldemort
Harry and Dumbledore are go to the cave that where Lord Voldemort hidden hides his horcrux.
Horcrux is dark magic.
(Horcrux was as an object in which a Dark Wizard or Witch had hidden a fragment of his or her soul in order to become immortal)
And Harry find needs to find that thing and destoryed. destroy it.