"I think they’re in Evan’s office," Harry told them, shrugging when their heads snapped up to look at him. "It makes the most sense. I don’t think Evan’s here —he and Barty always celebrate Christmas Day together. So his office would make sense. Because if he’s taken leave from the school, no one’s going to go rummaging around in his office if he’s not here. And it’s in a secluded part of the dungeons, anyway. No one would hear anything. And that’s not withstanding silencing charms. "