David, Gerrold. Star Wolf Trilogy.

Read by Chris Sorenson

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

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