In 1301, a fragile peace exists between Edward of England and Philip IV of France. But in the fetid alleys of medieval London and Paris the secret agents of both countries still fight their own silent, deadly battle. The Prince of Wales wallows in luxury under the sinister influence of his favourite, Gaveston, who dabbles in the black arts and has secret political ambitions to dominate the young prince and English crown. These scandals are threatened with exposure on the mysterious death of Lady Eleanor Belmont, a former mistress of the prince, who is found dead at the foot of the nunnery steps, her neck broken. Was it suicide? Accident? Or malicious murder?

Edward turns for help to his master spy, Hugh Corbett, whose task is to resolve not only Belmont's death but other grisly murders. In doing so, he faces the deadly rivalry of his French counterpart, the murderous rage of Gaveston and the silent threats of assassins as well as the lies and silken deceits of his own master...