‘If you haven’t been helping him,’ he said, with a furious glance at Black, ‘how did you know he was here?’ ‘The map,’ said Lupin. ‘The Marauder’s Map. I was in my office examining it –’ ‘You know how to work it?’ Harry said suspiciously. ‘Of course I know how to work it,’ said Lupin, waving his hand impatiently. ‘I helped write it. I’m Moony – that was my friends’ nickname for me at school.’ ‘You wrote –?’ ‘The important thing is, I was watching it carefully this evening, because I had an idea that you, Ron and Hermione might try and sneak out of the castle to visit Hagrid before his
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