Hanover leaned forward. ‘Both ends of the Copernicus–Florida gate are linked to shielded servers that maintain constant radio contact with each other. If the servers at either end of a wormhole gate stop transmitting, for any reason, it triggers a major security alert.’

He sat back. ‘Now say, for whatever reason, there’s only one person in a position to respond to that alert; maybe because there’s been an attack, or – and this is why they set things up this way in the first place – because something alien and vicious, something completely unknown, has come through one olony gates. That puts all the rest of the gates in equal danger. What they don’t tell you is that it’s possible to simultaneously shut down not just one wormhole gate – but all of them.’

‘Why have I never heard about this before?’

‘Because it’s such very dangerous knowledge,’ Hanover replied. ‘It’s the kind of thing you really don’t want your enemies knowing. Or most of our friends, for that matter. If there isn’t an immediate response to the security alert – within, say, half an hour – the two-man rule is automatically rescinded and just the one person can trigger a gate shutdown. Are you following me?’

‘That’s what happened to the Galileo gate, isn’t it?’ asked Saul. ‘You were in charge of the investigation, and you were the one who dismissed the idea that EDPs had played a part in causing the wormhole to collapse. But Donohue told me you’d been playing both sides, that you gave the separatists everything they needed to cut Galileo out of the network. Did you tell the separatists the same thing you’re now telling me?’

‘Let’s just say,’ said Hanover, ‘that I wasn’t given a great deal of choice in the matter.’

Saul stared at him, momentarily speechless. All these years, and the man responsible for so much pain and anguish had been right there, working for the same people as he did. But instead of anger he felt only a curious emptiness, as if a cavity had been dug out of the core of him.

Hanover regarded him with evident amusement. ‘Are you really sure you’re up to this, then?’

‘No, but I don’t feel like I have any choice either.’

Hanover nodded wearily and bent over the side of his chair to retrieve the Agnessa. ‘You should probably go now.’ He stood up stiffly, inspecting the gun before heading towards a bank of elevators, without so much as another glance at Saul.

‘Wait,’ Saul called after him.

Hanover paused, without turning. ‘Please don’t try and stop me, son. Especially since I’m armed. I hope you manage to pull this off, I really do. But to be frank with you, I’m glad I won’t be around to find out, either way.’