four o'clock
How would four-thirty this afternoon suit you ? '' `` That would be fine . '' The rest of the day dragged slowly . At four o'clock Bennett left his office and took the elevator to the ground floor . Under his arm he clutched the briefcase which might spell death for him . A moment after he left his office building , he knew he had made a mistake -- a fatal one ! Idly , at first , his mind 's eye watched the driver of a long gray sedan , parked at the curb , start up its motor as he approached .