four o'clock
Dan asked . `` I ca n't imagine , '' Beth said . `` I let him out myself ; everybody else had gone to bed . And I 'm sure of the time , because I thought he was never going away , and I was tired ; and I looked at the clock and said , ` It 's four o'clock , and I must go to bed . ' '' Dan 's face had darkened . `` Do you mean to say you were sitting up with him alone ? '' he demanded .