A historical figure, the 24-year-old Kagi is John Brown's Gideon and Secretary of War, and the only follower whom narrator Sir Harry Flashman considers brave and intelligent. This makes him a threat to Flashy's secret efforts to thwart a raid in Harper's Ferry, VA. Kagi is Swiss-American, dapper, well-read, and anxious for action. He analyzes with Flashy a well-drawn map and agrees with Flashy's initial strategy. He is glad finally to meet a professional soldier. Ready to laugh, Flashy asks him about the logistics of a massive slave rebellion. Flashy decides that he must let Kagi gradually perceive for himself that the raid is hopeless. Brown will accept this verdict from him alone. Staff meetings about crazy ideas trouble Kagi until at Chambersburg, PA, Kagi voices his concerns to Flashy: the slaves will not want to rise until after the harvest, when owners inhumanely sell them. Kagi hates waiting.