Outworld Invaders: Agents of ISIS, Book 9 by Stephen Goldin
Series: The Agents of ISIS.
Approx. 60,320 words.
Published on March 2, 2010 by
For centuries, now, humanity has expanded into space without encountering an alien civilization. Suddenly, the peaceful outlying planet Omicron is attacked by an ominous outside threat--and the Imperial Special Investigation Service finds itself joining forces with the conspiracy it's been battling for years to save mankind from external danger.