six o'clock
The king turned hastily , and the glance which he fixed upon Pollnitz was so flashing , so threatening , that even the bold and insolent master of ceremonies trembled . `` Are you convinced of the truth of what you have stated ? '' said he harshly . `` Sire , '' said he , `` if you wish to convince yourself , it is only necessary to go this evening between five and six o'clock , unannounced , into the rooms of the Princess Amelia . You will then see that I have spoken truth . '' Frederick did not reply ; he stepped again to the window . and looked silently into the street .