The angle's a little awkward, but it's not hard for Alex to haul Elizabeth up to the top of the wall.

"What kind of security do they have?" she asks quietly. She doesn't hear any guards, though they could just be out of earshot. Her hearing's not so good only a week after the new moon. She can't think of a reason why a school would need any high-tech security, but a school where something fishy's going on might be a different story.