It was here that Jean Valjean was; as we said, on perceiving the black shadow standing on watch at the corner of the Rue Droit-mur and the Petite Rue Picpus, he fell back, for this phantom was doubtless watching for him. What was to be done? He had no time to retrograde, for what he had seen moving in the shadow a few moments previously in his rear was of course Javert and his squad. Javert was probably already at the beginning of the street at the end of which Jean Valjean was. Javert, according to appearances, was acquainted with this labyrinth, and had taken his precautions by sending one of his men to guard the outlet. These conjectures, which so closely resembled certainty, whirled suddenly in Jean Valjean's troubled brain like a handful of dust raised by an unexpected puff of wind. He examined the blind alley; that was barred. He examined the Rue Picpus, a sentry was there, and he saw his black shadow distinctly thrown on the white moonlit pavement. To advance was falling into this man's clutches; to fall back was throwing himself into Javert's arms. Jean Valjean felt himself caught in a net which was being slowly hauled in, and looked up to Heaven in despair.
In order to understand the following, the reader must form an exact idea of the Droit-mur lane, and in particular of the angle which the visitor left on his left when he turned out of the Rue Polonceau into this lane. The lane was almost entirely bordered on the right by poor-looking houses, on the left by single slim-looking edifices, composed of several _corps de logis_, which gradually rose from one floor to two as they approached Little Rue Picpus so that this building, which was very lofty on that side, was very low on the side of Rue Polonceau, where, at the corner to which we have alluded, it sank so low as to be only a wall. This wall did not run parallel with the lane, but formed a very deep cant, concealed by its corners from any observers in Rue Polonceau and Rue Droit-mur. From this cant the wall extended along Rue Polonceau up to a house bearing the No. 49, and in Rue Droit-mur, where it was much shorter, up to the frowning building to which we have referred, whose gable it intersected, thus forming a new re-entering angle in the street. This gable had a gloomy appearance, for only one window was visible, or, to speak more correctly, two shutters covered with sheet zinc and always closed. The description of the locality which we are now giving is strictly correct, and will doubtless arouse a very precise souvenir in the mind of the old inhabitants of the quarter.