Azelio abandoned the argument and the cabin fell into a despondent silence. Ramiro almost wished he hadn’t argued against Agata’s first, cheerful verdict. He couldn’t imagine what Azelio was going through, but even his own brief, hallucinatory experiences of fatherhood offered a hint. Nothing could be more harrowing than being forced to contemplate the death of the children you’d promised to protect.

‘Maybe the Councillors are going to shut down the system themselves,’ he suggested. ‘Just because Greta denied it doesn’t mean they won’t do it.’

‘But why would they?’ Tarquinia asked irritably.

‘If it’s a choice between that and the destruction of the Peerless,’ Ramiro replied, ‘then I don’t believe they’d choose the latter. Whatever their flaws, they’re not that deranged.’

Azelio was taking no comfort from the theory. ‘But are they deranged enough to think that that’s their choice? If you can’t avoid a meteor by choosing your trajectory, how can you avoid it just by switching off the messaging system?’

Agata had a different objection. ‘If they did shut down the system, wouldn’t that be an unsupported loop? They’d only be doing it because they learnt that it was going to happen.’

‘There’s not much complexity to it, though,’ Ramiro argued. ‘It’s hardly the same as learning a whole new theory of the vacuum from your future self; all they have to do is flick a switch.’

‘The Council wouldn’t want the mountain destroyed,’ Tarquinia agreed, ‘but they might well share Azelio’s view about their choices. They’ve come into this looking for a vindication of the system – so I don’t see anything inconsistent if they find themselves receiving three years’ worth of reports from the future that all describe them clinging to their original position: that the whole thing’s a boon, and there couldn’t possibly be any reason to shut it down deliberately.’

Ramiro ran his hands over his face. ‘Forget the Council, then. Let’s assume that there’s no chance of them causing the disruption. What’s the next most benign explanation?’

‘We could do it ourselves,’ Tarquinia suggested.

‘How?’ Azelio demanded. ‘What could we do that would be harder to see coming than a meteor at infinite speed?’

‘I have no idea yet,’ Tarquinia admitted. ‘But at least we’re isolated from the messaging system for a few more stints. We ought to be less vulnerable to the innovation block.’

Agata said, ‘But in the end, it would only be the shutdown itself that would have driven us to find a way to cause the shutdown.’

‘And that’s meant to stop us?’ Tarquinia was undeterred. ‘If that kind of loop really is too unlikely to be true, then we’ll find out eventually. But the only way to know is to try it.’