It was ominous and determined, and in a panic of terror she rose to her feet.

If it was the law, come after Jack, what should she do?
Or again, suppose it was the Unknown who had threatened them with death?
Not coherent thoughts these, but chaotic, bringing panic with them.

Almost unconscious of what she was doing, she reached into the drawer beside her, secured the revolver there and leveled it at the door..