Prisoner's Hope

Description for PRISONER'S HOPE by David Feintuch:

THE SEAFORT SAGA
There is no refuge in the galactic abyss. Aboard a starship or groundside, safety is an illusion. Terrifying creatures of the void menace the fragile lives dinging to the shores of the oceans beyond.

Assigned to Hope Nation while recovering from injuries, Captain Nicholas Seafort is appointed liaison to the wealthy planters of the verdant colony planet. But, reeling from a savage alien attack, the U.N. space flotilla flees homeward, and the colonists seize their moment to rebel. His beloved wife and closest friends gone, Seafort must halt a revolution and rally the ravaged colony against the inhuman invaders.

But to save the world, Nicholas Seafort must forsake his vows--and commit an unthinkable, suicidal act of high treason...

This is #3 in The Seafort Saga.