"No one ever thinks to check the house elves," Ron said, knowing he sounded like Hermione. "But they'll know what's going on, or most of it. They'll at least be able to tell us where all the people are." The ghosts could help too, but Ron hadn't seen any in his search.
He paused, playing back her last few words. Had he heard wrong? "Three months? Mrs. Malfoy, the Battle was almost five years ago." Something was even more wrong than he'd thought unless Narcissa Malfoy had some sort of amnesia.
"I don't think there are any professors here, let alone Professor McGonagall."