Sokolov and one other security consultant made a thoroughgoing reconnaissance of the forty-third floor. They began by clambering up on the conference table. The consultant gave Sokolov a leg up, enabling his boss to pop up through a ceiling tile and commence an exploration of the crawl space above the ceiling. The ceiling grid itself was made of flimsy aluminum extrusions, suspended from the true ceiling by a web of wires, and completely incapable of supporting a person’s weight. Assuming that this half of the building was a mirror image of the vacant suite next door, however, there were heavy steel trusses at regular intervals, consisting of T-shaped beams connected by zigzagging rods of steel, and a reasonably acrobatic person could use those as monkey bars to travel around above the ceiling. Zula, Peter, and Csongor, sitting on the floor and eating their rations in the middle of the vacant space, heard Sokolov and scraping and clanging as he made his way overhead, and heard him thumping in an exploratory way on the walls that defined the boundary between this suite and the elevator lobby/bathroom core. The conclusion seemed to be that those walls went all the way up to the underside of Floor 44 and that this suite, therefore, could neither be escaped nor infiltrated by the common action-movie trick of moving around above the ceiling. In the same spirit, Zula looked around at the ventilation louvers and noted that they were all far too small to admit a human body.