London, 1921. Prominent Cabinet minister Lord Amersham has been shot dead outside his Regents Park home, two bullets to the chest and one to the forehead. The killing bears the hallmarks of a professional hit. Tackling one of the most high-profile cases Scotland Yard has ever faced, DCI Paul Stark is under pressure to produce a quick result. Amersham's colleague, Secretary of State for the Colonies Winston Churchill, is convinced the Bolsheviks are responsible. Stark's colleagues at Special Branch believe there's a connection to the Government talks taking place over Irish Home Rule. Or could the motive be connected to Lord Amersham's scandalous private life? Then there is a second murder, once again committed by an expert marksman at close range - and the case takes a terrifying new twist ...