In Austria, Katrin is lonely after her sister's marriage and she agrees to marry her father's research associate Dr. Walter Fane. Fane takes her to China but constantly ignors her in favour of his medical research. Lonely Katrin has an affair with Jack Townsend of the British Embassy. When it is discovered by Walter he becomes very bitter. Fane travels to fight a cholera epidemic and Katrin goes with him and helps. They grow closer together than ever before but Walter is knifed in a riot incited by the burning of a cholera infested town. Now their new found happiness will depend on Walter's survival.