What is this chapter mainly about?
According to Professor Lupin, why do the dementors affect Harry more than others?
What do Fred and George give Harry as an early Christmas gift?
Who enchanted the bludger to chase after Harry?
Who says he is sure that Sirius Black is near Hogsmeade?
Who was Sirius Black's best friend when he was a student at Hogwarts?
What troubling information does Harry overhear at the Three Broomsticks?