The secret passageway is behind a mirror on the fourth-floor of Hogwarts Castle. It appears in Harry Potter and the Prisoner of Azkaban.
It is largely unknown but it was found by James Potter, Sirius Black, Remus Lupin and Peter Pettigrew when they attended Hogwarts. They put it in the Marauder's Map. It presumably leads to Hogsmeade and is one of the three secret passageways that Argus Filch didn't know about. Fred and George Weasley found it using the Marauder's Map in their first-year. They used the passageway until winter three years later when it caved in.[1]
Notes and sources[]
- ↑ 1.0 1.1 Harry Potter and the Prisoner of Azkaban, Chapter 10