Stephen Goldin 
Counterfeit Stars—Agents of ISIS, Book 8 [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.
Having had its plans thwarted too many times by the Imperial Special Investigation Service, the evil conspiracy declares war directly on the brave men and women who serve in the agency.
Impostors sabotage the Service’s work, and the Commissar himself falls under suspicion. ISIS must confront itself to prevent being torn apart from within.