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In Turkistan, during World War I, British Army officer Michael Andrews is saved from death under the Kurds by British Secret Service agent John Stevenson. The two men then save the Balkari tribe by leading them, along with their livestock, across mountains. When John kills an enemy spy, Michael suspects John and attacks him, but fractures his own leg. In Cairo, Michael is nursed back to health by nurse Rosemary Haydon and they fall in love. Before they can marry, however, Rosemary reveals that she is married to a British Secret Service agent whom she has not seen for three years. Her husband turns out to be John Stevenson, who, realizing Rosemary no longer loves him, sets out to murder Michael, who is on a mission to save a British fort in Sudan. After John arrives, the fort is ambushed by African tribesmen and only he and Michael survive. Crossing the desert to warn the British relief troops, John risks his life to save Michael from the advancing Africans and dies in Michael's arms.