midnight
`` I simply adore this knocker , '' Bobs declared , jubilantly . `` Hark , let 's hear the echoes . '' The knocker was lifted and dropped again , but though they all listened intently , a sudden confusion on the river made it impossible to hear aught else . `` My private opinion is that Marilyn 's ghost would much prefer some other spot for midnight prowls , '' Bobs remarked , as the old key was being fitted into the queerly designed lock . `` Imagine a beautiful , sensitive girl of seventy-five years ago trying to prowl down there where barges are tied to soot-black docks and where derricks are emptying coal into waiting trucks . No really romantic ghost , such as I am sure Marilyn Pensinger must be , would care to prowl around here . '' Miss Selenski smiled at Bobs ' nonsense .