Until he saw a gun in her hand moving in his direction, he would wait and observe. Without shifting the SIG, he removed his finger from the trigger.

The woman stood in the doorway a few seconds longer, then disappeared back into the hallway. As Quinn lowered his gun, he could hear her steps moving toward the op room.

Quietly, he made his way back to the door, stopping just short of the jamb. The woman continued down the hall away from him, still unaware of his presence. As soon as he was sure she’d entered the op room, he headed for the rear exit.

When he reached it, he checked back down the hallway, then stepped outside.

It was another ten minutes before the intruder exited the building. Quinn watched her from behind a couple of old weather-beaten signs. She moved with caution, but not as much as she’d used entering the building. Quinn could now see she was Caucasian, in decent shape, and probably about ten years older than he was.

He waited until she had rounded the side of the building out of sight, then crept out from behind the signs. The woman only had two choices: return to the back of the building or head toward the main road. Of the two, the latter made the most sense.

Instead of following her, Quinn cut over to the other side of the building and made his way to the street, paralleling the path she would be taking on the far side.

He stopped at the corner, tight to the wall, and did a quick visual sweep. The areas in front of the warehouse and off to the right were deserted. The building next door, a dingy two-story monstrosity with more windows broken than intact, was dark and dead.