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.
As soon as they Apparate into Hogsmeade Village, a scream rends the air, alerting the Death Eaters to their presence. They’re taken in by the barkeep of the Hog's Head, who hides them from the Death Eaters and makes up an excuse for the alarm going off. Once he’s thrown them off the trail, he closes the door and looks Harry, Ron, and Hermione up and down. Harry suddenly recognizes him as Dumbledore’s brother. Hefinds out that Aberforth is the one who sent Dobby to rescue them when Harry shouted into the mirror.
Aberforth also tells them the truth about Dumbledore’s past, and agrees to help them get into Hogwarts. He speaks to the portrait of his dead sister, Ariana. She leaves and brings back none other than Neville Longbottom.