Madhusree followed him from hut to hut as he gathered everything they’d need into a pile at the edge of the kampung. It made him nervous to see her running about freely, but it would have slowed him down too much to carry her everywhere, and after visiting the kitchen and peering through the doorway of the butterfly hut, she could see for herself that Ma and Baba were no longer in the kampung. He resisted the urge to warn her sternly to keep away from the garden; if he didn’t mention it, she wouldn’t even think of going there.

When he dragged the motorboat out of the storage hut, Madhusree seemed finally to accept that they were leaving.

‘Ambon!’ she shouted.

‘No, not Ambon. The ferry’s not running. We’re going south, all by ourselves.’

The boat and its outboard motor were both made of ultralight carbon-fibre composites. Normally his father carried the motor in his arms, to and from the beach, while his mother carried the hull over her head. Prabir had planned to push the hull all the way to the beach, fully loaded, but his first exploratory shove was enough to convince him that he’d never succeed. He’d have to make at least four trips: the hull, the motor, fuel and water, then food, clothing and everything else.

‘Shit!’ He’d almost forgotten. He went back into the storage hut and pulled down the two smaller life jackets from their hooks on the wall. He stared uncomprehendingly at the two larger ones remaining, then he turned and walked out.

He couldn’t put Madhusree back in her cot; even if she didn’t start screaming, he wasn’t willing to leave her alone again. So he carried the hull to the beach with Madhusree following him on foot. The hull was incredibly light, but since his arms couldn’t quite stretch between the sides of the upturned boat at its centre of gravity, he either had to hold it nearer to the bow, where the sides were closer together—in which case he had to fight the unbalanced weight—or walk with his arms straight up and his palms supporting the floor of the boat, which was almost as awkward and tiring. He ended up alternating between the two methods, but he still had to stop and rest after ever-shorter stretches. This did have one advantage: Madhusree had no trouble keeping up with him.

He rested on the beach for a few minutes, then carried Madhusree back to the kampung and started out with the motor. A third of the way to the beach she sat down on the path and refused to walk any further. Prabir knelt down and coaxed her into putting her arms around his neck and clinging to his back with her legs. He usually hooked his arms under her legs when he carried her this way, reinforcing her grip and taking some of her weight, but the motor made that impossible. As her legs grew tired, she ended up virtually hanging on to him by her arms alone, and though Prabir leaned forward to try to shift some of her weight on to his back, by the time they reached the beach she was crying from exhaustion.

For a moment he was tempted to leave her on the beach— what harm could come to her, sleeping beneath a palm tree?—but then he wrapped her in his arms and trudged back to the kampung. He managed to hang the three bags of clothes and food from his neck and shoulders, leaving his arms free.

Down to the beach, back to the kampung. Two cans of fuel and two cans of water remained—each weighing about ten kilograms. He’d been fooling himself: even without Madhusree, he’d never have been able to move them all in one trip. Cradling her in his right arm, holding her against his side the way his mother did, he carried the cans to the beach one by one.

By the time he dropped the last can of fuel on to the sand beside the boat, it was almost three o’clock. Prabir dug his notepad out of one of the bags: it was fully charged, which meant eight hours’ normal operation, but the battery drained three times faster when the screen had to be electronically illuminated. Still, even if they were at sea in darkness he wouldn’t need the map constantly visible.

Madhusree had grown resentful; she’d never been dragged back and forth like this for the sake of a boat trip before. She sat in the shade at the edge of the beach, calling for Ma every minute or two. Prabir replied soothingly, but equally mechanically, ‘We’re going to Ma.’

The notepad’s GPS software included a respectable world map, but Teranesia wasn’t on it; as far as the software was concerned they were already in the middle of the Banda Sea. The Tanimbar Islands were shown, but the smaller islands in the group were just blobs of two or three pixels, and the coastlines of the larger ones appeared crudely rendered, as if they’d been extracted automatically from a satellite image or a cheap printed map. With access to the net Prabir could have substituted the official navigation chart for the region, complete with water depths and information on currents; he’d viewed it a dozen times, but never thought to keep a copy in his notepad. But there was no use dwelling on that. At least Jakarta hadn’t been able to block the GPS signals; if he’d been left with dead reckoning, the sun and the stars, he would have been afraid to leave the island at all.

He fitted the motor to the hull, filled the fuel tank, then dragged the empty boat into the shallows. An image came to him suddenly, from a video his parents had watched back in Calcutta; he’d been asleep in his mother’s arms for most of it, but he’d woken near the end. A man on a deserted beach had tried to drag a wooden boat into the ocean, to make his escape from some war or revolution. But the boat had been too large, too heavy, and no matter how he strove it had remained firmly beached. Prabir shuddered at the memory, but at least he knew they wouldn’t share that fate. Whatever else happened, they wouldn’t be stranded.

He loaded everything into the boat. It sank dismayingly low in the water, but his parents’ combined weight must have been more than the weight of these provisions, and the boat had carried the whole family safely out to the ferry dozens of times. He fetched Madhusree; she didn’t struggle or complain as he fitted her life jacket, merely glaring at him suspiciously.

Prabir put her in the boat, then climbed in himself and stood looking back across the beach. He wouldn’t be gone long; if he completed the test his parents would have no reason to send him away, and everything would be back to normal within a couple of days. The poisoned chrysalis would be forgiven; it was only one butterfly out of all the thousands on the island. Anything could be forgiven if he proved he was capable of getting Madhusree to safety.

He started the motor. The boat rose up in the water and sped away from the beach, like an amphibious creature suddenly revived from a dormant state. Having the tiller firmly in his hand gave Prabir no immediate sense of control; he’d never been allowed to steer the boat. Nervously, he shifted the tiller back and forth a few degrees. The boat responded smoothly enough, turning more readily than he’d anticipated. This was encouraging, though it made his balance seem all the more precarious; if he stumbled and made the boat swerve sharply, the acceleration might knock him right off his feet.

He had to remain standing to watch for the gap in the reef. Prabir was used to recognising the gap as they passed through it, when safe passage was a fait accompli. The breaking waves approached with alarming speed; he hunted for a stretch of darker water, leading to a region where the waves raised less foam. He spotted one candidate, but he had no clear memories of the approach to confirm his choice, and the signs were far from convincing.

Madhusree looked up at him, disoriented, rubbing her eyes. ‘Baba should!’ she exclaimed accusingly. When Prabir ignored her she started crying. Tears flooded down her face, but Prabir was unmoved; she could make the slightest fit of pique sound like gut-wrenching anguish. He’d done it himself, countless times. He could remember that much very clearly.