seven o'clock
`` Leave me now , '' said Campbell . He turned and hurried out , just conscious that the dead man had been thrust back into the chair and was sitting up in it , with Campbell gazing into the glistening yellow face . As he was going downstairs he heard the key being turned in the lock . It was long after seven o'clock when Campbell came back into the library . He was pale , but absolutely calm . `` I have done what you asked me to do , '' he muttered . `` And now , good-by .