forming at the ticket windows where temporary barriers had been installed to help filter passengers. Dutta saw the detectives watching the screens.
“We’ve got a new office building just opened this month and two new blocks of student accommodation, totalling an extra 2,200 potential passengers, and they’re nearly all tube users. Usually it wouldn’t make a difference, but a couple of trade fairs just opened on Monday, one at the Excel Centre, the other at Earl’s Court, and there are a lot of visitors staying in the nearby hotels. We can regulate the number of people entering the station by reducing surface access, but we’ve already had to shut off the escalators several times this week because of passenger overload. The system works on the probability ratio of a certain number of travellers per day. It has trouble coping with unexpected demand.”
“I noticed you’re renovating some of the platform and tunnel walls as well,” remarked May. “How do you cope with that?”
“The equipment is stowed during tube working hours, but it means a couple of the monitors are disengaged. When you’ve only got four hours a night to find an electrical fault, it can take several days to sort out. What can I do for you gentlemen today? Is this about the escalator footage?”
“No, it’s a new problem that may be related. We’ve lost someone. He was supposed to catch the last southbound Piccadilly Line train last night. A student called Matthew Hillingdon.”
“That train would have passed through here at 12:24 A.M. The service was good last night. There’s a Northern Line train three minutes later and then that’s it until the next morning.”
“Ridiculous that we don’t have a twenty-four-hour system,” Bryant complained. “We know he texted his girlfriend from – what’s the nearest point to the trains that still has phone reception?”
“That would be the lower hall.”
“Below the escalators?”
“He’d get general coverage until about halfway down the final flight of stairs, but some networks have transmitter points on the Piccadilly,” Dutta answered. “He may have been able to transmit as far as the interchange, but not on the platform.”
“He texted her from King’s Cross at 12:20, a bit the worse for wear. He’d been out drinking with a mate and was heading for Russell Square tube.”
“That’s only a two-minute journey.”
“I know, but he never made it. I need to find out whether he got on the train. If he didn’t, perhaps we can see which exit he used from the station and collect witnesses from that point.”
“Okay, give us a couple of minutes. Everything’s digitally backed up 24/7, so it shouldn’t be hard to nail. Most of the cameras are recording constantly. As you pointed out, a couple of tunnels are being retiled, so they’re not fully covered, but we can pick up action on the platform overheads.”
The detectives seated themselves in the darkened room and studied the screens around them. “Look at all these passengers. Why do people have to move about so much?” asked Bryant irritably. “Everyone would get a lot more done if they just stayed in one place.”
“You’re a fine one to talk,” May replied. “You can’t sit still for a minute.” He looked back at the screens. “They’re like blood cells pulsing through an artery.”
“That’s what they are. They’re feeding the city with energy. There’s no pushing or shoving; it’s so orderly and purposeful. Rather beautiful to watch.”
“Okay, we have this now.” Dutta punched a series of illuminated keys on what looked like a studio mixing board, and footage speckled through one of the monitors. “I’m starting it from 12:17 A.M. The left screen is the camera footage covering the interchange tunnels from the District & Circle to the Piccadilly. I’ve got another one covering the main entrance, but from what you’re saying there was no reason for him to leave the station. There are two ways of switching lines, depending on which end of the platform you’re coming from. The main problem is that one of the tunnel cameras was out, and one currently has restricted vision.”
“That’s not very efficient, is it?”
“Not our fault. Health & Safety carried out a junction install that’s affected some of the camera sight lines. We’re waiting to get the mountings resited. That’s not public knowledge, though, so we’re pretty well covered. The cameras are still up there. As long as people think they’re being watched, they behave themselves. What does your man look like?”
May passed over a photograph showing Matthew Hillingdon in a brown woollen hat and a long grey overcoat sewn with thin rainbow stripes. “He was hardly ever seen wearing anything else,” he explained.
“Well, it’s distinctive.” Dutta’s nimble fingers tapped at the speed controls as he checked the images. “The tube is still busy up to the minutes just before the last train, then it empties fast. Most Londoners have a pretty good idea how late they can leave it to get home. Is that him?”
“Too short,” said May.
“How about this one?”
The images in front of them fractured into blurred squares, then slowed and restored themselves as a man in a dark raincoat entered from the right of the camera field.
“Similar – but no, I don’t think so.”
Dutta tried again. “How about this one?”
“That looks like him.” May tapped at the rainbow coat. He checked the screen’s time readout, which had ticked to 12:21 A.M. The boy wavered at the far side of the screen. He was putting his mobile away, but appeared to be having trouble finding his pocket. Now they could clearly see the top of his brown woollen cap. Hillingdon had trouble staying upright as he staggered toward the stairs. There was a brief dark blur to his left.
“Wait – is there somebody with him?”
Dutta dialled the speed down to single frames. The blur vanished. “If there was, they knew how to stay out of the shot.”
“He’s very drunk. Can you get him from another camera?”
“No, that’s the one that’s out.”
Hillingdon had passed beyond the camera’s range now. The scene showed the shadowed empty arch of the half-tiled tunnel.
“There are two more cameras between the boy and the train,” Dutta explained. “One is situated in the short stairway leading to the platform; the other is on the platform itself.”
The detectives watched the deserted staircase, waiting for Hillingdon to appear. The time readout said 12:23 A.M. Suddenly a drunken figure burst into frame, striped coattails flying. He virtually fell down the steps in his rush to get to the platform.
“Hillingdon’s got less than a minute before the train is due, so can we assume he heard it approaching through the tunnel?” asked May. “Do your guards stop people boarding trains when they’re plastered?”
“If they look like they’re a danger to themselves,” said Dutta. “Hillingdon’s borderline. We get much worse. I don’t think there was anyone in the immediate area. More crucially, he probably wasn’t picked up by anyone viewing the monitors. It’ll be easy to check and see who was on duty.”
The screen was empty now. The stairwell’s fixed camera could only catch a figure passing through. Dutta switched screens, searching the tiled labyrinth.
“Now, this last camera is moveable and has a large wide-angle lens. It’s in the centre of the roof above the platform, and we can see everything that’s going on. It slowly pans back and forth to build a picture of the level as a whole. Plus, we can zoom in and pull off detailed shots, but they’re quite distorted. It’s really for general surveillance. Our clearest ID shots all come from the barriers rather than the platforms.”
He twisted a dial back and forth, and the image of the platform shifted from one end to the other. The time readout was now at 12:24. There were four other passengers waiting for the train, a middle-aged Chinese couple and two young black girls.
“Would it be hard to get witness traces on them?”
“Not if they used travel cards. They can’t be tracked if they just bought tickets, although we might get general descriptions from the counter staff.”
“Here it comes, right on schedule.”
They watched as the silvered carriages slid sleekly into the station. The camera had lost Hillingdon. The doors opened. Dutta panned the device back along the platform. At the last moment Matt Hillingdon’s striped overcoat and woollen hat shot into view. He was moving with dangerous speed. It clearly required a superhuman
