The lonely American

"Saigon, 1962; the United States is trying to help the South Vietnamese government defeat a communist insurgency. An American Air Force officer, David Emerson, meets a lovely young woman, Lucie Hong. David has a girlfriend back home, but Lucie arouses feelings in him that he can't control; and Lucie is swept off her feet. David disappears into the war and becomes a hero of the Air Force, flying 47 missions without a scratch to himself. But he never forgets Lucie. Some years after they've separated, he finds her, and she tells him about Emma, the daughter he gave her. Unlike so many others, David is not a man to love and run. When Saigon falls to the communists, David leaves his wife and son in California and hurries back to a flaming city which most people are trying to escape, desperately determined to rescue Lucie and Emma. They are nowhere to be found. Years go by; as tragedy strikes his own family, David manages to locate Lucie and Emma in France, and goes there. Lucie is lost to him, while Emma loathes and mistrusts him"--Amazon.com.