Harry Potter and the Prisoner of Azkaban · Chapter 17
The Shrieking Shack Revelation
Harry, Ron, and Hermione confront Sirius Black in the Shrieking Shack, learning that Peter Pettigrew is alive and that Black was framed for the Potters' betrayal.
Outcome
The truth about the Potters' betrayal is revealed, and Harry learns Sirius is his godfather.
