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.
They have a much harder time than they thought they would posing as Ministry workers. They’re asked questions they don’t know the answers to, asked to do things they don’t know how to do, and now that they’ve been forced to split up, have no idea how the others are doing in their quest to find Umbridge’s office.
Finally, Harry finds her office but is dismayed to find that the locket is not there. He manages to find Ron and they both head down to the dungeons, where they know Hermione was forced to go with Umbridge.
Harry is shocked to see that Umbridge is actually wearing the locket as she’s trying poor Muggle-borns in court. Finally, Harry can’t listen to her abuse any longer and he Stupefies Umbridge and her team. He rescues the poor Muggle-borns that almost surely would have been sent to Azkaban or even worse, gets the locket, and helps them all escape.