Timshar : The Mind Sounders; Book 1: Abduction

Aliens: They're here, they've always been here, watching...selecting...studying, as Stephanie discovered one day while running along the beach. She was being watched, she could feel it. But when she turned to look for whoever may be watching her, she saw nothing.

Black Hawk called them "go-bys". "Out of the corner of your eye you see something move. But when you look it has already gone by. A go-by."

(Excerpt) The massive ship maintained a vibration that rendered it invisible to the senses. Its outer surface was studded with 364 annex hatches. Some were vacant, others--occupied, the powerful blue-white rim lights of the drone ships pulsing steadily. In one of these he sat, studying her pattern at the console, familiarizing himself with her glyphs...waiting...