fleet. Still, there were other reasons to consider an increase in acceleration. And at the back of Skade’s mind was a dangerous and alluring possibility that would change the rules entirely. ‘And the other ship?’ Felka asked. ‘Where is that?’ Skade had already told her about the vessel behind them. Now a second circle bisected by two cross hairs appeared on the display almost exactly centred above the one that demarked Epsilon Eridani. That’s it. It’s very faint, but there’s a clear tau-neutrino source there, and it’s moving on the same course as us. ‘But a long way behind,’ Felka said. Yes. Three or four weeks behind us, easily. ‘It could be a commercial ship, Ultras or something, on a similar heading.’ Skade nodded. I’ve considered that possibility, but I don’t find it likely. Resurgam isn’t a very popular destination for Ultras, and if that ship were headed for another colony in the same part of the sky, we’d have seen lateral motion by now. We haven’t — she’s dead on our tail, Felka . ‘A stern chase.’ Yes, deliberately following us. They have a modest tactical advantage, you see. Our flame points towards them; theirs points away from us. I can track them because we have military-grade neutrino detectors, but it is still difficult. But they need no finesse to spot us. I have separated our thrust beams into four components and given them a small angular offset, but they need only detect a tiny amount of leaked radiation to fix our position. We are neutrino-quiet, however, and that will give us a definitive advantage after turnover, when we have to point our flame towards Resurgam. But it won’t come to that. That ship can’t ever catch us, no matter how hard it tries. The ship should be falling behind already,‘ Felka said. ’Is it?‘ No. So far she has maintained two gees all the way out from the Rust Belt. I didn’t think normal ships could accelerate that hard.‘ They can’t, not usually. But there are methods, Felka. Do you know the story of Irravel Veda? ‘Of course,’ Felka said. When she was pursuing Run Seven she modified her own ship to manage two gees. But she did it the crude way — not by improving the efficacy of her Conjoiner drives, but by stripping her ship down to a skeleton. She left all her passengers behind on a comet to save mass. ‘And you think that other ship must be doing something similar?’ There’s no other explanation. But it won’t help them. Even at two gees they cannot close the gap between us, and the gap will widen if we increase our inertia-suppression effect. They cannot match three gees, Felka; there is only so much mass you can strip out of a ship before you haven’t got a ship at all. They must be very near the limit already. ‘It must be Clavain,’ she said. You seem very certain. ‘I never thought he’d give up, Skade. It just isn’t his style. He wants those weapons very badly, and he isn’t going to let you get your cold steel hands on them without a fight.’ Skade wanted to shrug, but her armour would not allow it. Then it confirms what I have always suspected, Felka. Clavain is not a rationalist. He is a man fond of gestures, no matter how futile or stupid they might be. This is merely his grandest and most hopeless gesture to date . Clavain ran into the first of Skade’s traps eight hundred AU from Yellowstone, one hundred light-hours into the crossing. Clavain had been expecting her to try something; he would, in fact, have been disappointed and a little alarmed had she not. But Skade had not let him down. Nightshade had sown mines behind it. Over a period of weeks, Skade had dropped them from her ship’s stern: small, automated, highly autonomous drones stealthed for maximum invisibility against Clavain’s forward-looking sensors. The drones were small enough that Skade could afford to manufacture and deploy them by the hundreds, littering Clavain’s forward path with hidden obstacles. The drones did not have to be very clever or have great range. Skade could be quite certain of the trajectory that Clavain would be obliged to follow, just as he could be quite certain of hers. Even a small deviation away from the direct line between Epsilon Eridani and Delta Pavonis would cost Clavain precious weeks, further delaying his arrival. He was already lagging behind, and would not wish to incur any further hold-ups if he could help it. So Skade would have known that Clavain would remain on the same heading except for short-term deviations. That still meant she had a lot of space to cover. Explosions were not an efficient means of inflicting harm on space vessels at anything other than extreme close range, since vacuum did not propagate shock waves. Skade would know that the odds of one of her mines coming within a thousand kilometres of Clavain’s ship were so small as to be negligible, so there would be no point putting crustbuster-class warheads in them. Clavain expected, instead, that the mines would be designed to identify and fire at his ship across a typical range of light-seconds. They would be single-use launchers, particle beams, very probably. It was exactly what he would have done if he were being chased by a similar ship. But Skade had used crustbusters. She had inserted them, so far as Clavain could judge, into every twentieth mine, with a statistical bias towards the edge of her swarm. The warheads were primed to detonate as soon as he came within one light-hour of them, as near as he could tell. There would be a distant prick of hard blue light, shading into violet, red-shifted from Clavain’s rest frame by a few hundred kilometres per second. And then, hours or tens of hours later, another would detonate, sometimes two or three in close succession, stammering out of the night like a cascade of fireworks. Some were closer than others, but they were all much too distant to do any harm to Clavain’s ship. Clavain ran a regression analysis on the spread pattern and concluded that Skade’s bombs had only a one in one thousand chance of damaging his ship. The chances of a destructive strike were a factor of one hundred less favourable. Clearly, they were not meant for that purpose. Skade, he realised, was using the crustbusters purely to increase the targeting accuracy of her other weapons, flooding Clavain’s ship with strobelike flashes which nailed its instantaneous position and velocity. Her other mines would be sniffing space for the backscatter of reflected photons from his own hull. It was a way of compensating for the fact that Skade’s mines were too small to carry neutrino detectors, and were therefore reliant on outdated positional estimates transmitted back from Nightshade , many light-hours further into interstellar space. The crustbusters smoked Clavain’s ship out of darkness, allowing Skade’s directed-energy weapons to latch on to it. Clavain did not see the beams of those weapons, only the flash of their triggering explosions. The yields were about one hundredth of a crustbuster burst, which was sufficient to power a particle beam or graser with a five-light-second extreme kill
