midnight
`` I just wish father could hear them old stones hum . '' `` Oh , this is awful ! '' said Dorothy . She was shivering and sick with terror at this unseemly midnight revelry of her grandfather 's old mill . It was as if it had awakened in a fit of delirium , and given itself up to a wild travesty of its years of peaceful work . Shep was creeping about in the darkness . `` Look here !