They even copy each other being clumsy.”

Roland gave a dry, dismissive laugh.

“Just patch them up and let us go.

They have school in the morning.”

Dr.

Sato did not answer him.

She turned on her heel and walked out of the room, and a second later I heard the click of a lock.

And then her voice, raised, carrying through the door to a nurse in the corridor: “Call 911 and alert the county prosecutor’s office.

Lock down this corridor.

Nobody enters or leaves this room.” I watched the arrogance drain out of Roland Deming’s face for the first time in my life.

He crossed to the door and rattled the handle, and it did not turn, because a security guard was holding it shut from the other side.

My mother began to weep, loudly.

She did not, at any point, lean over to see whether my sister was breathing.

And I lay on that stretcher and understood that a stranger, in the space of one examination, had done the single thing that no one — not a teacher, not a counselor, not a neighbor, not our own mother — had done in three years: she had believed her own eyes, and she had locked a door, and in locking it she had opened the only one that mattered.