‘Shut up, Maddy,’ he suggested mildly. ‘You’re not fooling anyone.’ She redoubled her efforts, and gave herself hiccups. Now Prabir felt sorry for her; hiccups were awful.

They were approaching the reef. The channel he’d picked looked more promising than ever, but now that he had a target to aim for, steering was proving to be harder than he’d realised. The boat was headed too far to the left; he struggled to picture their motion from above, and the turning arc that would neatly convert their present course into the one they needed.

He glanced down at his notepad on the floor of the boat. He hadn’t thought he’d have any use for it until they hit the open sea; the software knew nothing of the reef, and at the present magnification the record of their entire journey so far was just a speck. But it was the map that was crude, not the navigation system. The commercial GPS that had superseded the US military version gave unencrypted signals that resolved the receiver’s position to the nearest centimetre.

Prabir shouted, ‘Notepad: zoom in. More… more… stop!’ The speck became a crooked line against a blank background; all landmarks had vanished from the screen, but the magnified trail of the boat itself gave him his bearings. He glanced back towards the beach, then compared how far they’d come with the distance remaining to the reef. The image at his feet made perfect sense now; he could place the channel on it in his mind’s eye.

He leant gently on the tiller, and observed the effect: in reality, and on the map. The curve was still too shallow; he nudged the tiller, watching the growing arc and visualising its extension.

The boat shot through the reef without a bump, without a scratch. Prabir was overcome with pride and happiness. He could do this, it wasn’t beyond him. He’d be reunited with his parents soon—and whether it was midnight or dawn when he finally tracked them down, it would be long before they’d expected him. They’d teasingly beg his forgiveness for ever doubting him, then they’d take him in their arms and spin him around, lifting him up towards the sky.

His elation lasted until sunset.

By daylight, everything worked as planned. The sea felt far rougher than it did from the ferry—and in bad weather it might have been suicidal to attempt the crossing in such a small vessel—but it was still musim teduh, the calm season, and for all its relentless lurching the boat didn’t take much water. Setting the right course was a matter of trial and error—quite apart from the current, the waves themselves seemed to deflect the boat as it cut across them—but by the time Teranesia’s volcanic peak had shrunk to insignificance the GPS software showed that they were making steady progress south-south-east, at about ten kilometres an hour.

Once she’d recovered from the shock of finding herself at sea—with no Ma, no Baba, no ferry full of strangers, and no real conception of where they were headed—Madhusree grew positively entranced by the experience. The expression of delight on her face reminded Prabir of the way he felt in the middle of a wonderfully surreal dream. He was nauseous himself, but her fearlessness shamed him into stoicism. Madhusree sucked her bottles of fruit juice, ate a whole packet of biscuits, and used her potty without complaint. Prabir had no appetite, but he drank plenty of water, and urinated overboard to Madhusree’s scandalised laughter.

As darkness fell, the wind rose and the waves grew higher. Madhusree vomited as Prabir was dressing her against the chill, and from that moment her mood worsened steadily. His shallow wounds were aching and itching; he wanted the metal out, whether it was harming him or not.

When Madhusree fell fitfully asleep, Prabir felt a strong urge to hold her. He picked her up and wrapped her in a blanket, but there seemed to be no way to keep his hand on the tiller that wouldn’t make them both uncomfortable, so he laid her down again gently. He watched her for a while, half wishing she’d wake and keep him company. But she needed to sleep—and a few hours alone was a small price to pay to save himself from years of exile.

The blackness around the boat was impenetrable, untouched by the dazzling hemisphere of stars, but Prabir felt no sense of physical danger lurking in the gloom. The chance of an encounter with a pirate ship or any vessel involved in the war seemed slender. He’d glimpsed a couple of small sharks by daylight, but as far as he could tell they’d been passing by, uninterested in pursuit. And though he knew that the boat might yet meet a wave large enough to overturn it, there was no point worrying about that.

It was the dark water itself, stretching to the horizon—and for all he knew as far beneath him—that chilled him with its emptiness. There was nothing to recognise, nothing to remember. The monotony of the view and the chugging of the motor could never have made him drowsy; his whole body had forsworn the possibility of sleep. But even wakefulness here felt blank and senseless, robbed of everything that made it worthwhile.

He glanced down at Madhusree, and hoped she was dreaming. Strange, complicated dreams.

The moon rose, swollen and yellow, not quite half full. With nothing else in sight it was hard not to stare at it, though its glare made his eyes water. The sea around the boat became visible for forty or fifty metres, but it looked as unreal as the jungle looked at the edge of the light from the kampung.

Prabir held his notepad up to the moonlight. The map showed them less than ten kilometres from their destination. Instead of heading straight for the northernmost island, he decided to aim slightly to the west of it. If the map turned out to be perfect he’d still spot the land, and then he could turn towards it. But he couldn’t trust the map to be accurate down to the last kilometre, so it seemed safer to risk missing their target by veering too far west; they’d still hit the main island of the group, Yamdena, in another fifty kilometres. Going too far east would send them down through the Arafura Sea, towards the northern coast of Australia, six hundred kilometres away. The error would eventually become obvious, but he didn’t have the fuel for much backtracking.

When the cliffs came into view, Prabir wondered if he was hallucinating, conjuring up the sight out of sheer need. But the land was real; the journey was almost over. He checked the notepad: the software showed the boat north-west of the island… but the cliffs were to his right. If he’d aimed true, they would have missed the islands completely.

As they drew nearer, Prabir saw that the cliffs didn’t quite meet the water; there was a narrow, rocky beach below. He had no idea whether this island was inhabited, but he felt sure that his parents would be waiting here: it was the nearest land, the simplest possible choice. He thought of circumnavigating the island, looking for the boat they’d used to make the crossing, but he didn’t trust himself to spot it in the dark. If he’d had any reason to believe that there was a harbour or a jetty he would have searched for that, but he wasn’t prepared to chase after the mere possibility.

He steered straight for the beach.

There was a grinding sound at his feet and the boat came to a shuddering halt. Madhusree rolled off the bench where she’d been sleeping, into the gap between the bench and the bow. Prabir grabbed the food bag beside him, dropped his notepad in, zipped it closed and draped the handle around his neck. Then he leapt forward and reached for Madhusree; she was only just waking, whimpering and confused. He lifted her up, wrapped his arms around her, and jumped into the water.

His feet touched rock. The water was waist high.

Prabir started crying, shaking with relief and unused adrenaline. Madhusree gazed at him uncertainly, as if trying to decide between a show of sympathy and a competitive display of tears.