On the downside, we had to assume that the people were aiming for the beach. We also had to assume that two of them were Zeph and Sammy, and the other three were the Germans Jed had seen on Ko Pha-Ngan. We couldn't be sure about this because the people were too small to make out clearly, even to see a flash of blond hair, but it seemed likely.

I'd spent the rest of that day in a state of shock, sitting with Jed's binoculars clamped to my face, convinced – every time one of them appeared to move – that they were about to start swimming towards us. But they didn't start swimming towards us. In fact, they barely budged from their patch of sand, occasionally taking a brief dip or disappearing into the jungle for a couple of hours. After three or four similar days had passed, my initial level of panic became impossible to sustain. It faded, mellowing into anxiousness, finally settling as a generalized tension. With the tension I was able to think more clearly, and in a manner of speaking, relax. That was when the other aspects of my new detail began to emerge.

The first was getting to know Jed. We spent every hour until nightfall sitting on a rocky outcrop at the highest point of our island, and aside from the spying, all we could do was talk. Mostly we talked about Plan B, which was what we were going to do when they finally got here. The only problem with Plan B was that, like most Plan Bs, it didn't exist. We had several options but could never agree on which one to take. The option I favoured was that Jed went down to intercept them and told them that they weren't welcome on the beach, but he didn't want to do that. Although he was sure he'd be able to make them leave, he was also sure that they'd go straight back to Ko Pha-Ngan and tell everyone what they'd found. Instead, Jed wanted to rely on the natural barriers the island put up. There was the swim, they had to get past the dope fields, find the lagoon, and then find a way of getting down to it. Jed was confident that this obstacle course would put them off, apparently unconcerned that it had failed to deter me, Etienne, Francoise, the Swedes and himself.

It was during one of our endless Plan B discussions that I discovered Jed had once watched me in exactly the same way as we were now watching Zeph and Sammy. He'd seen the spiv drop us off and when we'd made the swim he'd told Sal – which was why she, Bugs and Cassie had been ready to greet us when we reached the camp. This was the main function of his detail, as a look-out, and the dope collecting had been more of a sideline. He went on to tell me that since his arrival there had been three groups that had tried to find the lagoon. Two had given up at one or other of the obstacles. The one to get through had been the Swedes'.

Knowing this made me feel marginally less guilty about having given out a copy of the map, because people were managing to find their way to us anyway. Jed explained they'd have heard about the beach as the Eden rumour Zeph had described. Jed himself had heard it from a guy in Vientiane, and 'with nothing better to do' he'd decided to follow it up. He'd had to check out six other islands in the marine park before finding the right one. The Swedes had gone on more concrete information. They'd overheard Sal talking with Jean on a Chaweng Rice Run.

It came as a surprise to me to hear that acting as a look-out was the primary function of my new detail. I couldn't understand why the job needed to be clouded in so much mystery, and Jed, in turn, was a little surprised to hear that the mystery existed. He admitted that Sal didn't want it talked about as she felt it would be bad for the atmosphere, but as far as he was concerned, the main reason he didn't talk about it was because nobody ever asked him.

This had led to my most interesting revelation about Jed, connected to Daffy's reaction to his uninvited arrival on the beach. I remembered Keaty telling me that the camp had listened outside the longhouse while Daffy shouted and Sal tried to calm him down. What I didn't know was that Daffy had refused to speak to Jed from that day on. For the thirteen months until Daffy had left the island, he and Jed had never exchanged a single word. It had been the original reason for the creation of Jed's detail – to keep him away from the rest of the camp for most of the day.

I felt a great deal of pity for Jed when he told me this. It explained why he'd always seemed so distant from the rest of us. His apparent aloofness was only because he felt he ought to keep out of people's way, even now that a year and a half had passed. It also explained why he so conspicuously accepted unpopular tasks, such as the Rice Run.

But Jed didn't appear to feel any pity for himself. When I suggested to him that it must have been hard to have faced such a cold reaction, he shrugged and said he could understand it.

'Something's bothering me,' I said, putting down Jed's binoculars.

Jed frowned. 'You and me both.'

'I'm afraid they'll find my rucksack.'

'…Your rucksack?'

'I hid my rucksack there, and so did Etienne and Francoise. We couldn't swim with them… and if they find our bags they'll know they're on the right track.'

'…How well did you hide them?'

'Pretty well. The thing is, I'm starting to think I might have copied the map down wrong. I drew it in a real hurry and there were a lot of islands to fill in. I remember there were differences between Daffy's map and the map in Etienne's guidebook too. I easily could have missed out an island between Ko Phelong and here.'

Jed nodded. 'It's possible.'

'So if they reckon they're on the right island, that explains why they haven't moved for the last nine days. They're checking the place out, looking for the beach… which they won't find… but they might find the rucksacks.'

'It's possible,' Jed repeated. 'But they might also have spent the last nine days wondering how the fuck they're going to get back to Ko Pha-Ngan.'

'And wondering how they could have been so stupid as to believe in a map that someone slid under their door.'

'That would make them about as stupid as you then.'

'Stupid as me… Yeah.'

Jed scowled and ran his hands over his face. 'What I want to know is what they're doing for food and water.'

'Magi-Noodles and chocolate. That's what we did.'

'And water? They'd have needed to take a barrel of the stuff to have lasted this long.'

'Maybe there's a source on the island. It's high enough.'

'Must be… I'll tell you what, though, you're wrong about that map. Look at them. They sit on that one spot all fucking day. It faces us, right? So they know this is the right island. They're sitting there and trying to work out how to reach us…'

I sighed. 'You know what we should do?'

'No.'

'We should take the boat and head round to them. Then we get them on board, set a course for the open sea, and make them walk the plank. Problem solved.'

Jed tilted his head at the sky. 'OK, Richard, let's do it.'

'OK. Let's.'

'OK.'

'OK.'

We looked at each other briefly, then I went back to staring through the binoculars.