            "It must be the door’s warding magic," Hermione explained as they straightened back up. "I believe that whenever someone tries to trace the disappearances, they suddenly stop, as if forgetting what they had been doing. Maybe not enough to notice there’s a problem, but enough that no real work is done to find the location. And because the aurors are likely using magic to keep track of their notes, the magic itself is being...warped by the door’s magic. Someone marks down a location with their wand, or writes on a charmed parchment, and poof," she said softly, letting the word hang in the air. "The work is gone."