Stephen Goldin 
Outworld Invaders–Agents of ISIS, Book 9 [EPUB ebook] 

Welcome to the first great space opera decalogy of the twenty-first century! Agents of ISIS is the 21st century re-envisioning of the Family d’Alembert series by its original author, an epic saga describing the fight to preserve humanity from the forces of chaos and destruction.
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.