The Morthans were physically and mentally superior. Descended from humans, they were now, literally, "more-than"human ... and considered the human race to be little better than animals. They would stop at nothing to conquer the remaining human-controlled worlds.
Docked for repairs after a harrowing battle with a Morthan ship, Jonathan Korie and his crew discover they have a Morthan imp aboard— a Morthan weapon so quick they have no chance of catching it, so clever they have no hope of outsmarting it and so deadly they have no choice but to try.