Lupin Reveals His Connection to the Marauder's Map

PAGES: 346-348

Remus Lupin reveals to Harry, Hermione, and Ron that he was one of the creators of the Marauder's Map, along with Sirius Black, James Potter, and Peter Pettigrew. He explains how he discovered that Black was on the grounds using the map. He then demands to see Ron's rat, Scabbers, claiming that the rat holds the key to understanding everything.