Artemis- Spotting Holly

  Butler opened the driver’s door, and after a moment slipped into the seat. Artemis folded the phone into its wallet. “Captain Short, I presume. Why don’t you stop vibrating, and settle into the visible spectrum?” Holly speckled into view. There was a gleaming gun in her hand. “Really, Holly, is that necessary?”
...
  “How did you know I was here?”

  Artemis steepled his fingers. “There were several clues. One, Butler did not conduct his usual bomb check under the car. Two, he returned without the items he went to fetch. Three, the door was open for several seconds, something no good security man would permit. And four, I detected a slight haze as you entered the vehicle. Elementary, really.”

-The Arctic Incident, Chapter 3