 But Patric Knowles is also excellent as the British husband of Mrs. Keith from whom she is early separated, and Florence Desmond is superb as a cheerful inmate in the prison camp.Indeed, a little fellow named Mark Keuning contributes immeasurably, too, as the 4-year-old son of the author to whom she desperately clings through her ordeal.Played against realistic settings, which vividly convey the meanness of the jungle prisons, and directed by Jean Negulesco for physical and emotional credibility, "Three Came Home" is a comprehensive film.