Other parents had teased us for it — for the code word, for the rule that no one picked Cody up who wasn’t on a short written list, for the practice runs where Porter would gently test him. If someone says I sent them but they don’t know the word, what do you do? And Cody, six then, seven, would roll his eyes and recite it: I don’t go, I run to a teacher, I yell. I used to think Porter was a little overcautious, a careful man’s excess.

I understand now that he had grown up inside this family, that he knew in his bones what these people were capable of long before he found the ledgers, and that some part of him had been quietly arming our son against them for years.

The drills had felt, at the time, like a game.

On that afternoon they were the reason a stranger walked away from that fence empty-handed, and I sat in the school parking lot afterward with my forehead against the steering wheel, thanking a dead man for his stubbornness.

My son was safe — a teacher had been at the door within seconds, and I had him home and wrapped in my arms by afternoon — but I understood now that Dax had stopped drawing lines he wouldn’t cross.