Loring straightened, cold sweat breaking out on his forehead, his eyes
darting to the entrance. The entrance was darkening again. A shadow had
fallen across it, partly blotting out the radiance from outside the
building.
It was not a massive shadow and he knew that it could not have been
cast by the flylike creature moving about in the darkness. It was an
advancing, not a retreating shadow, and it was very slender. It cut off
a portion of the light for only a fraction of the time it had taken the
insect to pass from the glow into the darkness. It was accompanied by
footsteps, quick, uncertain and a brief flurry of movement. Then the
slender intruder was inside the building, silhouetted against the glow
a few feet from the entrance.