It is twenty years since Jean-Baptiste Poncet, through his apothecary skills and daring diplomacy, cured the ailing Negus of Abyssinia and saved that country from the political ambitions of the Sun King, Louis XIV of France. Poncet now finds himself in Isfahan, capital of Persia, practicing medicine in the court of the Shah. In order to rescue his old friend Juremi, imprisoned in the Urals, Poncet travels in disguise to Russia, where he engages in...