A fortune has been stolen, enough to build a castle. It is 1338, Sir Roger de Bohun, the Banneret, is a man of many talents. Friend and confidante of his King, Edward III, he is frequently charged to carry out duties and missions that require the utmost discretion and secrecy. These, fortunately, often leave him time for his hobby: to pursue the ladies. But little does he know that the peace and tranquility of England is about to be shattered. The French have hired a fleet of Genoese war galleys to pillage the coastal towns of England. Their first target, Southampton, happens to be in Sir Roger's bailiwick. Meanwhile, Sir Eustace de Frage - Sir Roger's neighbour - is jealous of his new castle, and also covets his neighbour's wife - the fiery red-head, Lady Alice. He hatches his plot to take both and steals his neighbour's identity to have him declared an outlaw. When the French and Genoese attack Southampton, they bring along one of the first cannons that will change the way wars are fought forever. The raiders are driven off; but not before an important one of their number is taken prisoner. For Sir Roger, though, his troubles are compounded by his enemies closer to home as his new castle comes under attack...