Harry Potter and the Deathly Hallows, by J.K. Rowling, is the seventh and final book in the Harry Potter series.
Following the tragic events in the previous book, The Half-Blood Prince, Harry, Ron, and Hermoine embark on the quest that Dumbledore gave them. They must hunt down and destroy the remaining horcruxes, the items that Voldemort placed parts of his soul into. They know that this is the only way to defeat Voldemort for good.