Harry Potter and the Philosopher's Stone - Summary

Part 10

Malfoy arranges a midnight duel with Harry to settle the score, and Ron, Hermione, and Neville accompany him to make sure that he stays out of trouble. The four accidentally enter a forbidden corridor and come across a three-legged dog standing guard over a trapdoor. They leave the corridor quickly, but not before Harry has concluded that the dog is guarding the mysterious package from Vault 713.