Stephen Goldin 
Agents of the Imperial Special Investigation Service [EPUB ebook] 

The first great space opera decalogy of the 21st century, this boxed set represents the first time all 10 books have been gathered together in a single volume. It follows the exciting adventures of undercover agents working to preserve the peace and unity of a galaxy-spanning empire, despite treachery that turns up around every corner. The books include:
Tsar Wars
Treacherous Moon
Robot Mountain
Sanctuary Planet
Stellar Revolution
Purgatory Plot
Traitors’ World
Counterfeit Stars
Outworld Invaders
Galactic Collapse
Buying the books in this boxed set represents a saving over buying each volume separately.