Good hammock reading for hot days -- light and not too dreadful froth about a young American widow who, to take care of her child, becomes a naughty temperamental singing star in a Parisian revue. A South American whom she had thought dead, turns up again very much alive and very angry -- and her troubles begin. Of course, there is a happy ending. Mary Pickford's Why Not Try God? has stayed on best seller lists for months. This is -- to our surprise -- better reading than we anticipated.