What is this chapter mainly about?
Who was screaming and howling in the Shrieking Shack many years ago?
What is the name of the potion that helps Lupin keep his mind when he transforms into a werewolf?
Why were the Shrieking Shack and the tunnel to it built?
What did Sirius, Peter, and James do for Lupin, when they discovered he was a werewolf?
Why didn't Lupin tell Dumbledore that Sirius Black was an Animagus?