One dreadful night, in the shrouded mists of a London peasouper, an unknown assailant knifes Ross Davis of the Foreign Office. His mentor, Neil Griffith, not only discovers the body but is arrested for the murder. Though they haven’t known Neil long, Oxford Tutors/Sleuths, Catherine and Harry Bascombe, investigate at her mother’s request. Catherine is convinced that her mother’s beau would never murder his Foreign Office protégé and future son-in-law. As he is banned from returning to work until his name is cleared, Griffith convinces Catherine to take a temporary job liaising between him and his German Section at the Foreign Office. Anthony Eden, illustrious Foreign Secretary, believes Davis was murdered to cover up a heinous act—the leaking of military secrets to Hitler’s Germany. Tensions are already running high in the wake of Hitler’s march into the Rhineland, boldly breaking the Treaty of Versailles. Eden’s mole in the Abwehr, German Military Intelligence, leads him to suspect a traitor in Griffith’s own German Section. Inasmuch as MI5 believe they already have the murderer in Griffith, Catherine, and Harry focus their investigation upon this four-man division of the Foreign Office. As inquiries lead the duo in the direction of, not only Nazi but Communist and IRA conspirators, they realize they are not up against an average foe. They are courting a species of evil they have never before faced. As they probe the mysteries of the four charming suspects, danger stalks them through London streets, restaurants, and drawing rooms. Which one of the four is hiding deadly secrets they have already killed to protect? Will they be able to bring them to light before Neil Griffith is convicted of murder and high treason?