Harry Potter and the Dealthy Hallows is the seventh and final book in J.K. Rowlings Harry Potter series. Voldemort is continuing to accumulate power and it is up to Harry, Ron, and Hermoine to find the remaining Horcruxes to defeat him once and for all. When the Death Eaters descend upon Hogwarts, it leads to a battle that will affect the future of the wizarding world forever.
When Harry opens his eyes he is alone in a bright mist. The more he looks around the more it looks like he’s in some domed room. He thinks that he is in King's Cross. He sees an ugly, small crying child and before he can do anything about it, Dumbledore appears.
Dumbledore tells Harry that he (Harry) is really not dead, and explains to him that because Harry let Voldemort kill him, that piece of Voldemort that was inside Harry is now gone. Harry still doesn’t understand why he’s not dead, however, and Dumbledore tells him that because Voldemort used Harry’s blood to regenerate himself, Lily’s protection is now inside both of them. His body keeps her sacrifice alive, and it’s because of this that Harry is still alive.
Dumbledore also tells Harry about the Hallows, and how all this time Harry has had the magical Cloak from the legend. He explains all about his true past, his duel with Grindelwald, and their quest to obtain all three Hallows for themselves. He is sad and bitter about his past, but is determined not to have any more secrets from Harry.
He also tells Harry that he has a choice to stay or go back, and Harry decides to go back. Before going back, he looks at the child for the last time when Dumbledore tells him to pity the living, not the dead.