Pirates of the Thunder

A mothballed space fleet, the great ships were silent and shut down. Each up to fourteen kilometres long, they had been circling Jupiter in their hundreds for nearly a millennium. To the little band of fugitives, they were both their hope for the future and a terrible reminder of the past. Once they had been the slave ships of their time, transporting whole populations of unwilling humans to the star colonies at the behest of the Master System.
Now, reactivated, one might not only help them escape the Master System but take them in search of the five gold rings that were the key to its control and their freedom. Cautiously, nervously, their craft edged towards the huge empty hull that loomed in the sky before them...