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.
For the past few weeks, the Dursleys have been preparing to go into hiding. His uncle has been changing his mind every day, alternating between going and refusing to go. Now, he has convinced himself that Harry is just after the house, and will do some 'hocus-pocus' to get the deeds in his name the moment they leave. Harry manages to convince him of the danger that they're in, and that Voldemort's supporters will torture them for information on Harry if they're caught.
When two members of the Order arrive to take the Dursleys into hiding, their goodbye is an awkward one. Harry is surprised when Dudley expresses concern that they are leaving Harry behind. He is further shocked when Dudley thanks him for saving his life the summer before last. It appears that the Dementor attack brought on a change in Dudley, and Harry realises the cup of tea was probably supposed to be a present. Dudley shakes Harry's hand, something that Uncle Vernon could not face, and follows his father outside. Aunt Petunia appears to momentarily stop before she leaves, as if to say something, but instead follows her husband and son.