midnight
Frank turned on his heel and went on deck , where he relieved Lieutenant Hetherton , who had been on watch . `` Nothing to report , sir , '' said Lieutenant Hetherton , saluting . `` Very well , sir , '' was Frank 's reply , as he , too , saluted . It was after midnight , and Frank 's watch was nearing its end when the lookout on the port side called : `` Boat off the port bow , sir . '' Frank advanced to the rail . A moment later there was a hail from the water . `` What ship is that ? '