The Screaming Shack / HP

The events from the book "Harry Potter and the Prisoner of Azkaban" have been partially modified

The Golden Trio: Harry, Ron, and Hermione (third-year students) were in the Screaming Shack late one evening, along with Sirius Black (who had recently escaped from Azkaban), Remus Lupin (the Defense Against the Dark Arts teacher at Hogwarts), Peter Pettigrew (who had just been exposed and had transformed from a rat into a human), and Severus Snape. Sirius says: I knew it! Peter, you bastard, you're alive!

Peter Pettigrew betrayed James and Lily Potter, and he's also a Death Eater.