<P> On the last day of O.W.L. tests, Harry has a vision of Sirius being tortured by Voldemort in the Department of Mysteries . He tries again to illegally use Umbridge's office fireplace to communicate with the Order of the Phoenix's headquarters to make sure the vision was genuine, and is told by Kreacher the house - elf that Sirius is indeed at the Ministry, before Umbridge catches Harry and his friends in the act . Snape is summoned to provide Veritaserum in order to question Harry, but he claims to have no further stocks of the potion left . Remembering that Snape is also a member of the Order of the Phoenix, Harry gives him a cryptic warning about Sirius's fate, but Snape claims to have not understood it . </P> <P> Umbridge decides to use the illegal Cruciatus Curse on Harry to interrogate him on Sirius's whereabouts . She also reveals she herself ordered the Dementor attack on him, intending to have him either silenced or discredited . Hermione intervenes and in order to create a distraction, convinces Umbridge that they are hiding a weapon of Dumbledore's in the Forbidden Forest . Harry and Hermione lead her into an area of the forest inhabited by centaurs, where Umbridge provokes them into taking her captive . The centaurs are furious upon learning that Hermione used them to do her bidding and turn on the pair, but Grawp arrives and clashes with the centaurs, allowing Harry and Hermione to escape . </P> <P> Luna, Ron, Ginny, and Neville join them in the forest and all six fly to the Ministry on thestrals, expecting to find and rescue Sirius . Once in the Department of Mysteries, Harry realises that his vision was falsely planted by Voldemort; however, he finds a glass sphere that bears his and the Dark Lord's names . Death Eaters led by Lucius Malfoy attack in order to capture the sphere, which is a recording of a prophecy concerning Harry and Lord Voldemort, which is revealed to be the object Voldemort has been trying to obtain for the whole year, the Dark Lord believing that there was something he missed when he first heard the prophecy . Lucius explains that only the subjects of the prophecies, in this case Harry or Voldemort, can safely remove them from the shelves . During a heated fight Neville accidentally kicks and smashes the prophecy . Harry and his friends, soon joined by members of the Order, enter a battle with the Death Eaters, during which Bellatrix Lestrange kills Sirius and Voldemort himself arrives to kill Harry, but Dumbledore rescues him and climatically fights the Dark Lord to a stalemate . In the midst of the duel, Voldemort unsuccessfully tries to possess Harry in an attempt to get Dumbledore to kill the boy, then escapes just as Cornelius Fudge appears, finally faced with first - hand evidence that Voldemort has truly returned . </P> <P> In his office, Dumbledore explains that Snape had understood Harry's cryptic warning, and had subsequently contacted Sirius, learning that he was still at Grimmauld Place . After Harry failed to return from the Forbidden Forest, Snape deduced where he had gone and alerted the Order of the Phoenix, allowing them to save Harry and his friends . It is revealed that during the Christmas holidays, Kreacher had interpreted a command of Sirius's as an order to leave the house, and went to Narcissa Malfoy, the wife of Lucius, and told them about Harry and Sirius's close relationship; Voldemort subsequently realised that he could lure Harry to the Department of Mysteries by tricking him into thinking that Sirius was in danger there . </P>

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