At the bottom of Ulva lies the Holdfast, a crumpled mess of old ships that form the colony’s foundations. Hidden in its dark recesses are items from a time when humans lived on the surface, a time before they were forced to take shelter in the oceans.
Calder trawls the mangled ruins in the hope finding something that will make him rich. A chance encounter means he no longer has to do it alone, now he has a partner, a girl named Trice.
The darkness contains more than treasure though, it hides secrets too. When the pair stumble into a gang of slavers and their latest captives, they put their lives on the line to rescue one, but what will their heroics cost them?