Out on the stairs, lighted taper in hand, the laughing Fandor closed the two leaves of the door with the utmost care, and went forward whistling a marching tune. His objective was a certain little staircase leading to the top story of the Palais, and this he mounted with vigorous determination. There was no likelihood of chance encounters, for there was not a soul in the vast building: the police were making their rounds outside it. Our adventurous journalist did not make his way upwards with stealthy tread--there was no need for that. Having gained the top floor, he went straight to a corner where an ebony ladder was ensconced, a ladder which had long been the joy and pride of the grand master of this part of the Palais, the amiable Monsieur Peter. "Pretty heavy!" grumbled Fandor, as he carried it upwards. Under the roof he caught sight of a skylight, rested his ebony ladder against it, and climbed briskly on to the roof. From thence Fandor had a view that was fairy-like. Spread out in the distance were the sparkling lights of Paris. He was divided from them by the vast mass of roofs about him, by a gulf of empty space, and beyond, by a dark blur--the two arms of the Seine flowing on either side of the Palais de Justice.... The mysterious darkness! The fascination of the sparkling points of light!... Fandor gave himself a mental shake.... This was no moment for dreaming under the stars! From his pocket he took a tiny, folding dark lantern; from his pocket-book he drew a paper, which he spread out and proceeded to study. As he bent over it, he murmured: "A bit of good luck that I was able to get hold of a complete and detailed plan of the Palais de Justice! Without it I never could have found my way among these roofs!" He examined the plan for some minutes; made a note of various landmarks; then refolding it, he gained one of the sloping roofs facing the quay of the Leather Dressers: "Now," thought Fandor, "I must be just above the Depot! And now to find out how Jacques Dollon, dead or living, has got out of the Depot! No use thinking of a window, for the cell has not got one! Fuselier has reason on his side when he declares that you do not get out of the cells of the Depot, nor out of the Palais!... Well, now--to carry off Dollon, dead or living, by way of the Palais Square, or by the boulevard, is out of the question: there are too many people about!... To carry him off by one of the exits, on to either of the quays, is equally out of the question: there are the sentries, in the first place, and then comes the Seine--then Jacques Dollon has left the Depot, or he has not, or, at any rate, he is still somewhere in the Palais--unless ..." Fandor interrupted his cogitations to light a cigarette: smoking helped him to think things out: