“And then what happens?” asked D’Agosta.
Ippolito grinned. At a console, he pressed some buttons. A large screen illuminated floor plans of the Museum.
“The interior of the Museum,” Ippolito continued, “is divided into five cells. Each cell includes a number of exhibit halls and storage areas. Most of these run from basement to roof, but, because of the Museum’s structural framework, the perimeters in cells two and three are a little more complicated. When I flick a switch on this panel here, thick steel doors drop down from the ceilings to seal off the interior passages between cells. The Museum windows are all barred. Once we’ve sealed off a certain cell, the burglar is trapped. He can move around within one section of the Museum, but he can’t get out. The grid was laid out in such a way that the exits are external to it, making monitoring easy.” He moved over to the layouts. “Let’s say someone manages to steal an object, and by the time the guards arrive, he’s left the room. It won’t make any difference. Within a few seconds, the chip will have sent a signal to the computer, instructing it to seal off that entire cell. The whole process is automatic. The burglar is trapped inside.”
“What happens if he takes the chip off before he runs?” D’Agosta asked.
“The chips are motion sensitive,” Ippolito continued. “That would set off the alarm, too, and the security doors would instantly descend. A burglar couldn’t move fast enough to get out.”
Pendergast nodded. “How do you reopen the doors once the burglar has been caught?”
“We can open any set of doors from this control room, and each security door has a manual override on it. It’s a keypad, actually. Punch in the right code, and the door comes up.”
“Very nice,” Pendergast murmured. “But the entire system is geared toward preventing someone from getting out. What we’re dealing with here is a killer who wants to stay in. How will all this help keep tonight’s guests safe?”
Ippolito shrugged. “No big deal. We’ll just use the system to create a secure perimeter around the reception hall and the exhibition. All the festivities are taking place inside Cell Two.” He pointed to the schematic. “The reception is taking place in the Hall of the Heavens, here. That’s just outside the entrance to the Superstition exhibition, which is itself within Cell Two. All the steel doors for this cell will be closed. We’ll be leaving only four doors open: the East Door of the Great Rotunda—which is the gateway to the Hall of the Heavens—and three emergency exits. All will be heavily guarded.”
“And what parts of the Museum exactly does Cell Two consist of?” asked Pendergast.
Ippolito pushed some buttons on the console. A large central section of the Museum glowed green on the panels.
“This is Cell Two,” Ippolito said. “As you can see, it reaches from the basement to the ceiling, as do all the cells. The Hall of the Heavens is here. The computer lab and the room we’re in now, Security Command, are both inside this cell. So is the Secure Area, the central archives, and a variety of other high-security areas. There will be no exit from the Museum except through the four steel doors, which we’ll keep open on override. We’ll seal the perimeter an hour before the party, drop all the other doors, and set up guards at the access points. I’m telling you, it’ll be more secure than a bank vault.”
“And the rest of the Museum?”
“We thought about sealing all five cells, but decided against it.”
“Good,” said Pendergast, eyeing another panel. “In the event of a crisis, we wouldn’t want any emergency personnel to be hampered.” He pointed at the illuminated panel. “But what about the subbasement? The basement areas of this cell may well connect with it. And that subbasement could lead almost anywhere.”
“Nobody would dare try to use that,” Ippolito snorted. “It’s a maze.”
“But we’re not talking about an ordinary burglar. We’re talking about a killer that’s eluded every search you, I, or D’Agosta here have mounted. A killer that seems to call the subbasement home.”
“There is only one stairwell connecting the Hall of the Heavens to other floors,” Ippolito explained patiently, “and it’ll be guarded by my men, just like the emergency exits. I’m telling you, we’ve got this figured out. The entire perimeter is going to be secure.”
Pendergast examined the glowing map for some time in silence. “How do you know this schematic is accurate?” he asked finally.
Ippolito looked a little flustered. “Of course it’s accurate.”
“I asked: how do you know?”
“The system was designed straight off the architectural drawings from the 1912 reconstruction.”
“No changes since then? No doors knocked open here, sealed off there?
“All changes were taken into account.”