... By Horace Horsnell The Dark River (Whitehall) ABSENCE, they say, makes the heart grow fonder, and exile deepens the longing for home. Subtler, more deeply hidden longings, they tell us, are a common malady. These may range from unconscious desire to return to carefree childhood, to regret for more adult havens of lost happiness and content. Appreciating the dramatic possibilities ol such a ...