When Cass called us during the kidnapping, I noticed how, in describing the guards’ positioning during the champagne welcome, she knew exactly where they were. She could see their positions. I asked her for elaboration, and she explained, with pride visible even in iMessage, how she’d figured out she could locate the receiving signatures of their earpieces and map them onto a layout of the home and grounds. Including now. Including the “walking perimeter” in the hallways surrounding the study.