Harry Potter and the Prisoner of Azkaban

The third installment of the highly successful Potter Series: Harry Potter and the Prisoner Of Azkaban is of a much darker nature in comparison to its predecessors. In this book Harry comes face to face with the Dementors; the terrible guards of the wizard prison Azkaban; whose mere presence leeches out all the joy and warmth out of a place and brings out ones most terrible fears to the fore making the person miserable and cold. The book is about a prisoner Sirius Black; a convicted mass-murderer; who has escaped the inescapable wizard prison and how his past is intermingled with Harry's past. Follow Harry as he discovers the truth of the manner of his parents death and how he unmasks the traitor amongst his father's best friends. Alongside the main storyline the book is filled with the usual fill of magic, quidditch, fights between friends, dangerous beasts such as Hippogriffs and Werewolves and the echoes of a prophecy.

An excerpt from the book:

There was a soft, crackling noise, and a shivering light filled the
compartment. Professor Lupin appeared to be holding a handful of flames.
They illuminated his tired, gray face, but his eyes looked alert and
wary.
"Stay where you are," he said in the same hoarse voice, and he got
slowly to his feet with his handful of fire held out in front of him.
But the door slid slowly open before Lupin could reach it.
Standing in the doorway, illuminated by the shivering flames in Lupin's
hand, was a cloaked figure that towered to the ceiling. Its face was
completely hidden beneath its hood. Harry's eyes darted downward, and
what he saw made his stomach contract. There was a hand protruding from
the cloak and it was glistening, grayish, slimy-looking, and scabbed,
like something dead that had decayed in water...
But it was visible only for a split second. As though the creature
beneath the cloak sensed Harry's gaze, the hand was suddenly withdrawn
into the folds of its black cloak.
And then the thing beneath the hood, whatever it was, drew a long, slow,
rattling breath, as though it were trying to suck something more than
air from its surroundings.
An intense cold swept over them all. Harry felt his own breath catch in
his chest. The cold went deeper than his skin. It was inside his chest,
it was inside his very heart....
Harry's eyes rolled up into his head. He couldn't see. He was drowning
in cold. There was a rushing in his ears as though of water. He was
being dragged downward, the roaring growing louder. .
And then, from far away, he heard screaming, terrible, terrified,
pleading screams. He wanted to help whoever it was, he tried to move his
arms, but couldn't... a thick white fog was swirling around him, inside
him-