Falaki gazed back at her blandly. He was serious.

Nasim said, ‘I think we might pass on that.’

Martin had been taking the disinhibitor for nearly a week before Nasim finally found the time to sit down and review the effects of the drug. There’d been an initial rise in the number of new synapses being characterised, but that much was almost inevitable; for a major pharmacological intervention to have revealed nothing new would have been as strange as if the shift from winter to summer had left the pedestrians of Tehran traipsing out identical routes through the city – making no tracks to hitherto unrevealed parks or outdoor cafés.

Even beyond that anticipated surge, though, the drug had continued to pay off. Before, the barrage of images had been sending Martin rapidly into a glazed, unresponsive state, almost independent of the details of the content being shown to him. Now, each new image elicited a fresh response; Nasim could see the splash of activity in every scan.

They had long ago dragged Martin up and down the highways of his life, engaging with every significant biographical event, every ethical concern, every strongly held belief and aesthetic preference. But that had not been enough to map the whole landscape – to delineate the topography that kept those highways from tumbling away into the void. What made any given human brain entirely distinct from another came down to details that were far too minor to be recounted by the subject, too minor even to be of interest to them, too minor, in fact, for any sane person to tolerate having to contemplate them, hour after hour, day after day. Only by shutting down the parts of Martin’s brain that were choking on the sheer quantity of minutiae had it become possible to start gathering the information they needed.

Now the side-loading software had massaged the Proxy into a form that mimicked virtually all of Martin’s fragmentary responses. If the data kept coming through at the current rate, within a month or so they’d have the Proxy in a stable state, ready to test in short scenarios.

Ready for a conversation.

Nasim cleared all the scans and histograms from her screen and sat contemplating the endpoint of the process. A child could take comfort from just about anything: a stuffed animal, a cartoon character, a mythical figure in a storybook who lived out the same plot over and over. The imprisoned Zal that Javeed had been so delighted to encounter had been nothing but a set of branching script fragments.

But Martin was not Javeed’s cartoon hero. He could not be replaced by a clip library of favourite scenes. Either the Proxy would capture the actual dynamic between them, or it would be useless.

The question was, could it be enough without being too much? When she’d built the blank receptacle for the side-loading process, Nasim had used the best functional maps available, but every choice had involved a trade-off. Every region she’d omitted risked robbing the Proxy of something it would need for its task; every region she’d included risked burdening it with goals it had no power to achieve and desires it had no power to fulfil.

So could the Proxy come close to recreating the way Martin would have spent an hour in Zendegi with his son – answering all of Javeed’s questions, sharing all his jokes, vanquishing all his fears – and still not know, or care, precisely what it was itself?

Nasim had done her best, but the only way she’d know for sure on which side of the line she’d fallen would be to ask the Proxy, face to face.

‘Do you get along with birds?’ Shahin asked.

‘Of course!’ Javeed replied. ‘I even met the Simorgh once.’

‘The Simorgh?’ Shahin laughed. ‘Well then, an eagle shouldn’t trouble you one bit.’ He took a strip of leather from a small pail sitting on the ground beside him and wrapped it around Javeed’s right hand. ‘Hold your arm up, boy.’ Javeed complied. ‘A little higher,’ Shahin suggested. ‘I want to be sure he can see you way down there.’

Shahin whistled, and took a piece of rabbit meat out of a second, covered pail. Martin heard the swish of wings before he spotted the eagle approaching, descending from a nearby cypress tree. Javeed flinched slightly as the bird came closer; he turned his face aside, but he managed to keep his arm motionless. When the eagle alighted on his leather-bound fist, it found itself unable to wrap both feet at once around this tiny perch. Martin feared that it might sink its talons into the unprotected skin further up Javeed’s arm – and though his gut reaction was all about the nonexistent threat of pain and injury, the risk of the bird puncturing the illusion of its own physicality seemed real enough. But instead, it managed a kind of balancing act, shifting from one foot to another as it gobbled the rabbit flesh that Shahin dangled in front of it as a reward. Javeed wouldn’t feel its weight pushing his arm down, but the glove could probably manage a convincing impression of those four long, muscular toes clenching and unclenching.

They had come to the estate of King Kavus in the hope of accompanying him on his latest folly. Javeed loved all the stories of Kavus, and in the bowdlerised children’s version they were harmless enough, but Martin had baulked at exposing him to detailed immersive depictions of the king’s bloodthirsty military misadventures. Against the advice of Zal and countless others, Kavus had invaded Mazanderan, the land of demons and sorcerers, where his army had engaged in mass-slaughter – in the original, blithely hacking into unarmed men, women and children. The White Demon, protecting his land and people, had blinded Kavus and his soldiers and rounded them up as prisoners, whereupon Zal’s son, Rostam, had embarked on a quest to rescue the vain young king. This had involved slicing witches in half, pulling the ears off innocent bystanders and ultimately cutting out the White Demon’s liver and using his blood as a balm to restore Kavus’s sight.

Kavus’s repentance over the Mazanderan fiasco had proved to be shallow and insincere; he remained bloated with pride and immune to good counsel. But after scouring Zendegi’s catalogue of Shahnameh scenarios, Martin had finally found a Kavus story that was free of acts of evisceration, and he’d managed to talk Javeed into accepting it in lieu of the bloodier alternatives.

‘Now you feed him,’ Shahin told Javeed. ‘Reach behind your back and I’ll pass you the meat.’ Martin watched nervously as Javeed accepted a strip of raw pink flesh, holding it gingerly between his thumb and forefinger. He brought his arm in front of him and quickly raised the meat towards the bird, releasing his grip as it seized the flesh in its beak.

‘You’re doing well,’ Shahin said. ‘Now we’ll put the hood on.’

Javeed looked to Martin for support; Martin smiled encouragingly. Shahin handed Javeed the leather hood, showing him how to hold it stretched out across his fingers and bring it over the bird’s head without alarming or annoying it. The hood had an aperture for the beak and nostrils and was loose enough to cover the eyes without touching them, but Martin still found it extraordinary that birds of prey really could be trained to accept these strange encumbrances.

At Shahin’s prompting, Javeed crouched down and slowly moved his hand and its passenger towards the wicker cage that sat beside them. Despite its blindness, as it approached the open door the bird deduced what was happening; it gave an irritated shrug and made as if to spread its wings and take flight. Javeed emitted a startled grunt, but he kept his hand steady and after a moment the bird allowed him to continue.

Shahin said, ‘Touch your hand to the side of the perch.’ Javeed did this, and the bird felt its way onto the wooden perch inside the cage. Javeed withdrew his arm and closed the door.