about
midnight
It did not take me very long to realize that that way lay my fortune of twenty thousand francs . But for the moment I remained very still . My plan was already made . At about midnight I went to the window and opened it cautiously . I had heard no noise from that direction for some time , and I bent my ear to listen . Not a sound ! Either the sentry was asleep , or he had gone on his round , and for a few moments the way was free .