War Drums

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.

The Galactic Game of conquest rages on. 
 
McNair rescues a member of an alien race he has never seen before. 
 
Pleading for his help McNair is dragged into an interplanetary conflict where he must decide the fate of the world. 
 
Who are the races and what is the basis for the conflict? 
 
Find out in War Drums 
Book 4 The Veterans of the Psychic wars