With the captain dead and the drop of demon's blood in hand, Thomas Edge and Sorrowful Barks are on a desperately short clock to conceal their crimes and make their escape--and find out what happened to Mary! The Caliban has made it away with precious minutes between them and the main bulk of the treasure fleet... but with a ragged crew and a crumbling ship. With little time to lose and two Atlantean craft closing in, Tarquin boards their stolen submarine and takes charge of the situation as only he can.