“I thought that was impossible in this day and age,” Warren Aspinal interjected mildly.

Diana’s humour became stern. “Under normal circumstances, yes. But what we’re attempting to do has no precedent.” She offered the others sitting at Hub One a reluctant shrug. “My team has got three AIs in the basement and two at the university which are attempting to access and analyse every single processor in the city simultaneously. It’s a refinement of Admiral Farquar’s idea of tracking the energy virus through the electronic distortion it generates. We’ve seen it demonstrated on Adkinson’s plane, so we know the approximate nature of the beast. All we have to do is perform the most massive correlation exercise ever mounted. We find out which processors have suffered glitches during the last eight hours, and cross-reference the time and geographical location. If it happened to several unrelated processors in the same area at the same time, then it’s a good chance the glitch was caused by someone who has the virus.”

“Every processor?” Vicky Keogh queried.

“Every single one.” Just for a moment, Diana’s dried-up face wore an adolescent’s smile. “From public net processors to streetlight timers, AV adverts, automatic doors, vending machines, mechanoids, personal communications blocks, household supervisor arrays. The lot.”

“Will it work?” Ralph asked.

“No reason why not. As I said, there’s a possible capacity problem, and the AIs might not manage to format the correlation program within the time frame we need. But when the program comes on-line it should provide us with the electronic equivalent of seeing footprints in snow.”

“And then what?” Warren Aspinal asked quietly. “That’s what you were really brought down here for, Ralph. What do we do with these people if we find them? There is something of a political dimension involved in using the SD systems every time we locate one of the afflicted. I don’t dispute the necessity of eliminating Adkinson’s plane. And people will certainly agree to us using force to obliterate the threat to start with. But ultimately we have to find a method of eradicating the energy virus itself, and without damaging the victim. Not even the Princess can go on authorizing such destruction for ever, not when it’s aimed against the Kingdom’s own subjects.”

“We’re working on it,” said Admiral Farquar. “Gerald Skibbow is going into personality debrief right now. If we can find out how he was infected, and how he was purged, then we ought to be able to come up with a solution, some kind of countermeasure.”

“How long will that take?” Leonard DeVille asked.

“Insufficient information,” the admiral answered. “Skibbow isn’t very strong. They’re going to have to go easy on him.”

“Yet if our preparations are to mean anything,” Landon McCullock said, “we have to catch the embassy duo tonight, or tomorrow morning at the latest. And not just them, but anyone they’ve come into contact with. This situation could escalate beyond our ability to contain. We must have a policy ready for dealing with them. So far the only thing we know that works is overwhelming firepower.”

“I’ve got two things to offer,” Ralph said. He looked at Bernard Gibson, and gave him a penitent smile. “Your squads are going to have to take the brunt of this, especially to start with.”

The police AT Squad commander grinned. “What we get paid for.”

“Okay, here it is then. First off, contact with someone who is carrying the energy virus doesn’t necessarily mean you contract it yourself. Will and Dean are excellent proof of that. They captured Skibbow, they manhandled him, they were in very close proximity to him for hours, and they’re both fine. Also, I was on the Ekwan with the embassy trio for a week, and I wasn’t infected.

“Secondly, despite their power they can be intimidated into submission. But you have to be prepared to use ultraviolence against them, and they have to know that. One hint of weakness, one hesitation, and they’ll hit you with everything they’ve got. So when we do find the first one, it’ll be me and my team which heads the actual assault. Okay?”

“I’m not arguing so far,” Bernard Gibson said.

“Good. What I envisage is spreading the experience of an assault in the same fashion the virus is spread. Everyone who is with me on the first assault will be able to familiarise themselves with what has to be done. After that you assign them to head their own squads for the next round of captures, and so on. That way we have your whole division brought up to speed as swiftly as possible.”

“Fine. And what do we do with them once we’ve subdued them?”

“Shove them into zero-tau.”

“You think that’s what got rid of Skibbow’s virus?” Admiral Farquar asked sharply.

“I believe it’s a good possibility, sir. He was extremely reluctant to enter the pod in Ekwan . Right up until then he was quite docile. When he found out we were going to put him in the pod, he became almost hysterical. I think he was frightened. And certainly when he came out of the pod at this end the virus was gone.”

“Excellent.” Warren Aspinal smiled at Ralph. “That course of action is certainly more palatable than lining them all up against a wall and shooting them.”

“Even if zero-tau isn’t responsible for erasing the virus, we know it can contain them the same way it holds ordinary people,” Ralph said. “We can keep them in stasis until we do find a permanent solution.”

“How many zero-tau pods have we got available?” Landon asked Diana.

The technology division chief had a long blink while her neural nanonics chased down the relevant files. “Here in the building there are three. Probably another ten or fifteen in the city in total. They tend to be used almost exclusively by the space industry.”

“There’s five thousand unused pods in the Ekwan right now,” Ralph pointed out. “That ought to be enough if this AI correlation program works. Frankly, if we need more than that, we’ve lost.”

“I’ll get some maintenance crews to start disconnecting them straight away,” Admiral Farquar said. “We can send them down to you in cargo flyers on automatic pilot.”

“That just leaves us with forcing infected people into them,” Ralph said. He caught Bernard’s gaze. “Which is going to be even worse than capturing them.”

“Possible trace,” Diana announced without warning as she received a datavise from one of the AIs. Everyone sitting at Hub One turned their attention on her. “It’s a taxi which left the spaceport twenty minutes after the embassy trio’s spaceplane arrived. The vehicle’s processor array started suffering some strange glitches five minutes later. Contact was lost after a further two minutes. But it can’t have been a total shutdown, because traffic control has no record of a breakdown in that sector this afternoon. It simply dropped out of the route and flow control loop.”

The warehouse which housed Mahalia Engineering Supplies was sealed up tight, one of twenty identical buildings lined up along the southern perimeter of the industrial park, separated from its neighbour by strips of ancient concrete and ranks of spindly trees planted to break the area’s harshness. It was seventy metres long by twenty-five wide, fifteen high; dark grey composite panels without a single window. From outside it looked inert; innocuous if somewhat spurned of late. Furry tufts of Ombey’s aboriginal vegetation were rooting in the gutters. Denuded chassis of ancient farm vehicles were stacked three or four deep along one wall, sleeting rust onto the concrete.

Ralph focused his shell helmet’s sensors on the broad roll-up door in the centre of the end-wall fifty meters in front of him. It had taken him and his team four minutes to get here from police headquarters in one of the force’s hypersonics, following the city-wide trail of route and flow processor dropouts located by Diana and the AIs. Three police Armed Tactical Squads had also been dispatched to the industrial park, under orders from Bernard Gibson. In total, eight of the little planes had landed, encircling the warehouse at a five-hundred-metre distance.