Right then, I took a slow breath and made a decision. I was not going to cry. I was not going to stand in a bathroom stall shaking while my daughter watched me fall apart. She needed to see me steady, so I was going to be steady.

I opened the camera on my phone and started taking photos. The seam. The tape. The device itself. The backpack label. Lily’s face while she explained, quietly and clearly, exactly what she had noticed and when. I wanted her account preserved while it was fresh, in her own words, documented.

Then I opened my notifications and found the Find My alert I had dismissed two hours earlier. I had glanced at it when we were getting out of the car and assumed we were parked near someone else’s keys or wallet, the way you do in a crowded lot. This time I read all the way through. An unknown AirTag had been traveling with me since that morning.

Since before we left the house.I opened our family group chat. At 11:14 in the morning, Diane had sent a message to the thread: cheerful, casual, the kind of thing she sent regularly. “How’s shopping going? Find anything cute for Lily?” I had not told her we were shopping. I had not mentioned this mall or this day to anyone. She had known where we were because she had known where the backpack was.

I texted Mark with the steadiness of someone who has already made up their mind about what comes next: Call me now. Emergency. Your mother.