six
o'clock
Their very appearance told its own story . Knowing them so well , those present understood the meaning of their unusual attire . For half an hour the two lingered among these friends who were so loth to part with them . Then the grandfather 's clock in the hall sent out its ringing chime of six o'clock . Tom and Grace exchanged affectionate glances . `` It is time to say good-bye . '' Grace 's clear voice wavered a little on the last word .