Earth Shadows by Daniel Arenson

The marauders, terrors from deep space, hit us hard. 
Our starships shattered. Our armies collapsed. Our cities crumbled. 
As Earth smolders, the marauders imprison us in camps. They farm us like cattle. They torture us for sport. Earth weeps. 
But there is hope. 
The Ghost Fleet, an ancient alien armada, might still exist in deep space. In a single starship, Sergeant Marco Emery and his friends seek this mythical fleet. They must find it. They must return with its might. 
Or the marauders will kill us all.
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