Defender- In Evil's Grasp Defender Series - Book 4

The Commonwealth is the ruling power in the galaxy. Until now the Commonwealth hasn't concerned itself with the worlds incapable of space travel. An enemy is slowly creeping into the galaxy, infiltrating the low-tech worlds. Supreme Executor Hale knows if this continues, in time, it will destroy the Commonwealth. Twelve star ships are sent out with minimal crews to approach the undeveloped worlds, making alliances before the enemy can gain a foothold on them. Captain Alexander leads his eleven crew members to these savage worlds, searching for the enemy's presence and developing allies. In exchange for small advances in technology, the crew buys loyalty from the naive worlds giving the Commonwealth advanced scouts in the coming war. It’s a simple enough assignment until the enemy begins pursuing the crew.