Kinshasa International Airport . Four weeks later.

'You have money?'

Russell Tracey and his son Ben looked nervously at the sinewy man in front of them who held their bags as though they weighed next to nothing. Ben had always quietly assumed that he was stronger than most of his friends, but even he had had trouble lifting his dad's heavy suitcase onto the check-in belt at Heathrow when they had started their journey more than twenty hours ago. Now this tough Congolese man, his skin a deep, ebony black and his close-cropped hair flecked with grey, had made him doubt himself.

'Um… I'm not sure what you mean,' Russell stuttered slightly, his northern accent sounding peculiarly out of place in the stark, basic surroundings of the airport. His eyes flicked down at Ben, and then back at the man who had already told them, in a gruff, unfriendly voice, that his name was Abele. A flash of a dog-eared identification card bearing the logo of the Eastern Congo Mining Corporation had told them that this was indeed the person they had been expecting to meet them.

It had been a real relief when they had heard Abele's deep and harshly accented voice calling their names out of the crowd. Within moments of stepping onto the airport concourse, they had been surrounded by a crowd of young Congolese, not much older than Ben, all jostling to try and carry their bags in return for payment. Russell had tried to tell them as politely as he could that their services weren't required; but his politeness had been met with indifference at best, aggressiveness at worst. One of their unwanted porters, older than the others and with a nasty glint in his eye, had started to argue with him. His English wasn't good enough for them to understand what he was saying, but the tone of his voice left them in no doubt that he was unimpressed that they were declining his offer of help. Ben's dad had instinctively placed himself between his son and the crowd of people who had gathered round to witness the argument, stuttering politely in English in an attempt to defuse the situation. So when they heard their names being called, he had let out an audible breath of relief.

It took a few harsh words from Abele in a language they didn't understand for the vultures to disappear and swoop on some other unsuspecting new arrival, though these were few and far between by now. But it seemed like this Abele wanted their money too.

He turned and started carrying their luggage towards the exit, with Ben and his dad trotting nervously along, one on either side. 'If you have money, take it out of your wallet. Leave only' – the Congolese thought for a moment – 'four hundred francs.'

They stepped through the automatic doors into the oppressive morning heat as Ben performed a quick calculation in his head. Four hundred francs – about fifty pence. He had forty pounds in his wallet, and travellers' cheques on top of that. Where was he supposed to put the rest of his money if not there? As if echoing his question, his dad spoke. 'What should we do with the rest of it?'

Abele continued walking along a poorly maintained road towards a group of cars. 'Put it in your shoes,' he said bluntly.

'I see,' Russell said earnestly. 'Well, if you think it's sensible…' and he removed his wallet from inside his light linen jacket. Beads of sweat were already forming on the bald part of his head.

'Not here!' Abele snapped, looking around to check that nobody had seen, then flashing Russell an impatient look. 'Wait until the car.' He strode on in silence.

The vehicle to which he led them looked as though it had seen better days. The green and orange stripes along the bonnet suggested it was – or had once been – a taxi, but if that was the case it was like no taxi Ben had ever seen. There were dents all over the side that was facing them, and patches of rust had entirely eaten their way through the metal. The rear bumper was hanging precariously at an angle. As Abele opened the boot, Ben was sure he caught sight of a large cockroach scurrying away from the sudden sunlight. He and his father climbed into the hard, uncomfortable back seat and both looked around for a non-existent seatbelt as Abele tried to turn the engine over. It took six choking coughs of the machinery before he managed to judder it into life, and as it did so, the inside of the car filled with the unmistakably greasy smell of petrol fumes. They jolted as Abele pulled out into the road and sped off, paying no attention to the fact that the rickety suspension made it feel more like a roller-coaster ride than a car.

Ben felt his brown combat trousers and white T-shirt start to cling to him in the heat. 'Why do we need to put our money in our shoes?' he asked, half out of a desire to break the uncomfortable silence that had descended on the car.

'Voleurs,' Abele spoke the word in his native French, and neither Ben nor his dad needed anyone to translate for them: robbers.

'Between here and Kinshasa, you think?' Russell asked lightly, sceptically almost, removing his wallet to act on Abele's instructions and giving Ben a nod that indicated he should do the same. 'We'll be safe in the car, surely?'

Abele smiled slightly, the first time he had done so since they had met, and displayed a full set of yellowing teeth.

'With you, I mean…' Ben's dad continued.

'In the Congo, Mr Tracey' – Abele spoke more slowly now, leisurely almost – 'the only person not at risk from voleurs is the man with no money.' He thought for a moment before continuing in a quieter voice, 'And even he is not safe.'

The car fell silent once again as Abele's passengers secreted their valuables in their shoes. Ben looked out of the window to try and divert his attention from the intolerable heat. The road was busy, and most of the cars were in a state of similar disrepair to Abele's, though occasionally there was something a bit more modern and in better condition. Occasionally they were passed by white minibuses filled with passengers – the bush taxis he had read about, Ben assumed.

After a while he almost managed to forget how fast Abele was travelling, and it came as something of a surprise when he slowed down rapidly. 'Checkpoint,' the black man muttered under his breath.

Ben and his dad exchanged a glance. 'Will we need our passports?' Russell asked.

Abele shook his head. 'No,' he muttered. 'Not passports.' His voice didn't encourage further questioning.

They crawled forwards, and it was five minutes before the checkpoint guards came into view. They wore khaki uniforms and grim expressions, and had ugly-looking AK-47s brandished under their arms. Some of the cars in the queue were waved through without question; others were held for longer before being allowed to go forward. Eventually it was their turn. A guard rapped harshly on Abele's closed window, and he opened it reluctantly. The guard peered in, looked at Ben and his father without emotion, then started talking to Abele. They spoke in deeply accented French that Ben could barely understand. Suddenly the guard turned his attention to the back seat and spoke slowly, more clearly. 'Mille francs, chaque personne,' he instructed.

Ben glanced into the rear-view mirror. Abele was watching him, and he shook his head imperceptibly. Ben took his lead and pulled his wallet from his pocket. 'Je n'ai que quatre cent francs,' he enunciated in his best French. I only have four hundred francs.

The guard looked at him suspiciously. 'Get out,' he said, reverting to English. Ben did as he was told. 'You too,' the guard told his dad, before turning back to Abele and saying, 'You, wait there.'

Ben and his dad stood uncomfortably together by the side of the car. One of Ben's hands brushed lightly against the metal, making him wince: it was piping hot. The guard snatched Ben's wallet from his hand and hungrily rifled through, pulling the few crumpled notes that had been stored away there and then handing it back. He gestured impatiently at Ben's dad, who also handed over his wallet, and was also relieved of his money. The cash in his hand, the guard visibly lost interest in his captives. 'Allez,' he muttered before turning to the next car in line; but he stopped in his tracks when he heard Ben speak.