A criminal named Sirius Black has escaped from Azkaban, a high-security jail for wizards, and he's looking for Harry.
Harry gets a firebolt, the top of the line of high-performance flying brooms.
Dementors, prison guards that drain the hope and happiness out of everyone around them.
The Sneakoscope, an object that spins and glows when untrustworthy people are nearby.
DEFENSE AGAINST THE DARK ARTS TEACHER:
Remus Lupin, a sympathetic and skillful wizard with a magic-er, tragic flaw.
The Patronus charm. It wards off dementors.
WHAT HARRY LEARNS:
That those we have lost are always with us, in particular when we need them the most.
NUMBER OF PAGES:
Click here to read about Book 4, Harry Potter and the Goblet of Fire.