1326. In France, King Edward II’s estranged wife Queen Isabella shames him by refusing to return to England and humiliates him further by flaunting her adulterous relationship with the king's sworn enemy, traitor Sir Roger Mortimer. When the king hears she has betrothed their son to the daughter of the Count of Hainault, all England fears an invasion of Hainault mercenaries. Meanwhile the Treasurer of England's life is threatened. He has made many enemies in a long political life, and Sir Baldwin and Simon must do all they can to find the would-be assassin before he can strike.