What is the summary for Chapter 11 of Harry Potter and the Sorcerer’s Stone?
It's Harry's first Quidditch match against Slytherin. He tries to prepare by reading a book Hermione had gotten from the library, but Snape takes the book away saying that the books aren't supposed to leave the library. As Snape walks away, Harry notices him limping. He overhears Snape talking to Filch about the 3-headed dog, and Harry becomes more suspicious about Snape's activities.
During the Quidditch match, everything is going well for Harry. He is flying well, and the crowd cheers. All of a sudden, his broom begins to fly dangerously, seemingly on its own. Hagrid mutters that only black magic could make a broom behave that way. Hermione scans the crowd and notices that Snape is staring at Harry, muttering under his breath. Thinking that Snape was putting a spell on Harry's broom, Hermione rushes over and sets Snape's robes on fire. When the professor jumps up and takes his eyes off Harry, suddenly Harry is able to gain control of his broom once more. He catches the Snitch and wins his first Quidditch match.
Later, Harry and Hermione tell Hargrid their suspicions about Snape, especially the bite from the dog. Hagrid says that the dog is his and that the dog is being used to protect a secret known only to Dumbledore and someone named Nicholas Flamel.