six o'clock
At night-time supervision is relaxed . The warder has to keep the offices in good order , and when he has his key in his pocket , certain that the heavy bolts and locks can not be forced , he comes and goes about the house . De Naarboveck was not only well posted in these details , but was aware that up to the day of Fandor 's trial , in view of the extra coming and going , it had been decided to give the guardian an assistant , and that this assistant would be at his post from six o'clock onwards . It was past six o'clock . The chances were , that when the false advocates knocked from the inside , the prison door would be opened to allow them egress by the supplementary guardian . De Naarboveck tapped on the peephole made in the massive door . The noise of heavy bolts withdrawn was heard ; the prison door was half opened : the warder 's face appeared .