Order of the Phoenix --- 35-38

Chapter 35: Beyond The Veil
Lucius Malfoy steps forward, demanding that Harry give him the orb. Harry doesn't know what the thing is, and he doesn't care. All he knows is that he wants to get his friends out alive. He is horrified when the Death Eaters tell him that his vision of Sirius was nothing more than a ruse from Voldemort to get him to the Ministry.
Harry tries to keep the Death Eaters talking so he can come up with a plan to get them out of there. He's surprised to find out that the orb he's holding has the secret why Voldemort tried to kill Harry on the night of his parent's death.
The situation comes to a head suddenly and they blast their way out of the ring of Death Eaters. Harry, Neville, and Hermione are separated from Ron, Ginny, and Luna, and Harry is terrified they're trapped somewhere with Malfoy and the others.
They run through various rooms in the Ministry, closely followed by some of the Death Eaters. In a skirmish with one of them Hermione is knocked out and Harry and Neville have to carry her out. They quickly run into the others Ron and Ginny are injured from fighting the Death Eaters. They're quickly found by some of the Death Eaters, and just when Harry thinks he's fighting his last battle help arrives from some of the members of the Order of the Phoenix. Sirius, Tonks, Moody, Lupin, and Kingsley rush through the door to their aid without a moment to lose.
Sirius urges Harry to grab the others and get out, but as he's doing so he's attacked and drops the prophecy. Due to the noise of the battle, Harry doesn't hear what it says. Right after the ghost of a prophecy fades away, Dumbledore arrives to save them.
It seems to happen in slow motion. Harry turns just in time to see Bellatrix Lestrange hit Sirius square in the chest with a powerful spell. He falls slowly through a magical doorway, and disappears.

Chapter 36: The Only One He Ever Feared
Harry races after Sirius, whom he believes is slumped just on the other side of the doorway. Lupin grabs him before he can go through looking for him. Harry is incensed when Bellatrix Lestrange escapes capture and he goes after her, his mind bent on killing her in retaliation for what she did to Sirius.
They're battling furiously when Voldemort arrives at the Ministry. He knows immediately the prophecy has been smashed, and tries to kill Harry. Just as he utters the Killing Curse Dumbledore arrives to save Harry.
The magic that passes between Dumbledore and Voldemort as they duel is like nothing Harry has ever seen. Suddenly Voldemort disappears and possesses Harry, causing him unendurable pain. He only stays a moment though, and is gone.
Fudge shows up and is finally convinced that Dumbledore has been telling the truth. Dumbledore creates a Portkey for Harry to get him back to Hogwarts, and promises he will meet Harry back in his office in half an hour.

Chapter 37: The Lost Prophecy
As he waits for Dumbledore in his office Harry is numb from despair. Knowing Sirius is dead and that it's all his fault is almost more than he can bear.
As Dumbledore tries to comfort him, Harry's temper explodes. He screams at Dumbledore and tears up his office in his rage, wanting his pain to end. He only quits when Dumbledore claims responsibility for Sirius's death, and begins to tell Harry the truth about Harry's past.
Dumbledore tells Harry a great many things, but most importantly he is able to relate the full prophecy that Sibyl Trewlaney made about Harry and Voldemort. Harry finds out that it's his destiny to battle Voldemort to the death.

Chapter 38: The Second War Begins
As the Daily Prophet proclaims Harry a champion for being "the lone voice of truth", Harry is at least relieved that everyone knows that Voldemort is back. He's having a hard time deciding if he wants to be around people or not, and drifts between the hospital wing to Hagrid's house to the lake. The knowledge that he will one day have to fight Voldemort to the death leaves him feeling separate from everyone else and very much alone.
As Harry tries to cope with his intense feelings of grief he finds comfort in the unlikely source of Luna Lovegood. On the train trip home he spends a few blissfully restful hours with his friends, and is happy to be met by all the Weasleys, Lupin, Mad Eye, and Tonks. They all troop over to where the Dursleys are standing and threaten them into treating Harry with respect. It means more than he can say that his friends stick up for him, and as he leaves with the Dursleys he smiles and waves farewell.

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