From the back cover:
There is a door at the end of a silent corridor. And it's haunting Harry Potter's dreams. Why else would he be waking in the middle of the night, screaming in terror?Harry and his friends have formed their own teen version of the very grown up Order of the Phoenix, at least that's what I considered it. They are subverting the new Defense Against the Dark Arts teacher and learning how to protect themselves against Voldemort and his followers.
Harry has a lot on his mind for this, his fifth year at Hogwarts: a Defense Against the Dark Arts teacher with a personality like poisoned honey; a big surprise on the Gryffindor Quidditch team; and the looming terror of the Ordinary Wizarding Level exams. But all these things pale next to the growing threat of He-Who-Must-Not-Be-Named - a threat that neither the magical government nor the authorities at Hogwarts can stop.
As the grasp of darkness tightens Harry must discover the true depth and strength of his friends, the importance of boundless loyalty, and the shocking price of unbearable sacrifice.
His fate depends on them all.
It was interesting this time around to pick up on different things seeing as I was mostly annoyed with Harry the first time I read this book. This time around I'm sympathizing with him for not being sure if he can count on anyone but himself.