My phone vibrated once.

Then again.

I was still seated at my desk, the glow from the city bleeding through the glass walls of my office, the hum of the building settling into evening quiet. Matthew had left less than ten minutes earlier, his parting instructions clipped, his eyes still calculating. He believed the day had ended. He believed he still had the perimeter.

I picked up my phone.

Carlos.

Three missed calls.

My breath caught.

Another message came through before I could open the ...