Ancestral Machines — Michael Cobley

No world is safe.

The Warcage: two hundred worlds harnessed to an articial sun in a feat of unprecedented stellar engineering. Built to travel through space as a monument to peace between alien species, now its voracious rulers have turned it into a nightmarish wasteland, capturing new planets for slaves and resources, then discarding the old.

Now, when a verdant agri-world is pulled out of its orbit, the captain of a smuggler ship must journey into the Warcage to rescue his crew.