Harry: “Messrs. Moony, Wormtail, Padfoot, and Prongs are proud to present the Marauder’s Map.”
George Weasley: We owe them so much.
Harry: Hang on. This is Hogwarts.
And that… No. Is that really…?
Fred Weasley: Dumbledore.
George Weasley: In his study.
Fred Weasley: Pacing.
George Weasley: Does that a lot.
Harry: So you mean this map shows…?
Fred Weasley: Everyone.
George Weasley: Everyone.
Fred Weasley: Where they are.
George Weasley: What they’re doing.
Fred Weasley: Every minute.
George Weasley: Of every day.
Harry: Brilliant! Where’d you get it?
Fred Weasley: Nicked it from Filch’s office, of course.
George Weasley: Now, listen. There are seven secret passageways out of the castle. We’d recommend…
George Weasley, Fred Weasley: This one.
Fred Weasley: The One-Eyed Witch passageway.
George Weasley: It’ll lead you straight to Honeyduke’s cellar.
Fred Weasley: We best hurry. Filch is heading this way.
George Weasley: Oh, and Harry, don’t forget. When you’re done, just give it a tap and say…
George Weasley, Fred Weasley: “Mischief Managed."
Otherwise anyone can read it.