He had walked a long way in the intense heat. Several times in the last twenty-four hours he had been struck by vertigo and thought that he was about to die. It had filled him with fear, or perhaps it was actually rage, and he had struggled on in a fury. The desert was endless. He didn't want to die here, not yet, and he had urged on Amos, fat Neka and the other black men he had hired in Cape Town who were driving his three oxen and the wagon in which his entire life was packed and tied with ropes. Somewhere ahead of them, deep inside the blinding heat, there was a trading post, and if he reached it everything would be all right again. He would not die. He would continue to search for his insects, to look for a damned fly that no one had ever seen before, which he would name after himself, Musca bengleriensis. He couldn't give up now. He had invested everything in this hunt for an unknown fly. So he struggled onward, and the sand and the sun sliced through his mind like knives.

Two years earlier he had been sitting in his student room on Prästgatan in Lund and listening to the sound of horses' hooves clattering on the cobblestones outside, as he studied an incomplete German map of the Kalahari Desert. He traced his finger along the coastline of German South-West Africa, north to the border of Angola, south to the land of the Boers, and then inland, towards the centre of southern Africa, which had no name. He was twenty-seven years old then, in 1874, and he had already given up all hope of completing his university studies and passing his exams. When he first came to Lund from the Cathedral School in Växjö he had thought of becoming a physician, but he fainted and fell like a heavy tree on his first visit to the Anatomy Theatre. The lecturer, Professor Enander, had clearly explained before the doors were opened that they were going to dissect a homeless, unmarried woman who had drunk herself to death at a brothel in Copenhagen and been transported back to Sweden in a pine box. She was a Mamsell Andersson from Kivik, who had fallen into the sinful life and delivered an illegitimate child at the age of fifteen. She had sought happiness in Copenhagen, where there was nothing to be found but misfortune. He could still hear the almost salacious contempt dripping from Professor Enander's introductory words.

'We shall be cutting up a cadaver that was already a cadaver even in life. A whore's cadaver from Österlen.'

Then they had entered the Anatomy Theatre en masse, seven medical students, all men, all equally pale, and Professor Enander had begun to slice open her abdomen. That's when he fainted. He struck his head on one of the hard steel edges of the dissection table; he still had the scar, just above his right eye.

After that he had abandoned all thought of a medical career. He considered joining the army but could envision nothing but a meaningless ritual of marching and screaming young men. He had dabbled in philosophy, and thought about becoming a pastor when he sat drinking with his friends, but there was no God, and finally he wound up among the insects.

He could still recall that morning in early summer. He woke with a start, as if something had bitten him, and when he threw open the window the stench from the street below made him sick. As if aware of sudden danger he quickly threw on his clothes, grabbed his walking stick, and strode out of town to the south, towards Staffanstorp. Somewhere along the road he grew weary and stepped into the bushes to rest and perhaps masturbate in the shade of a tree. And as he lay there a gaudy-coloured butterfly settled on his hand. It was a brimstone butterfly, but it was something else as well. The play of colours kept shifting on its wings as they slowly opened and closed. The rays of sunshine falling through the foliage transformed the yellow to red, to blue, and back to yellow. The butterfly sat on his hand for a long time, as if it had an important message for him, and then, as it suddenly took flight and vanished, he knew.

Insects.

The world was full of insects which didn't have names and had not been catalogued. Insects that were waiting for him. Waiting to be sorted, described and classified. He had returned to Lund, sought admission to the Botany Department, and although he was already a senior student the professor was kind and accepted him. During the summer he visited his home in Småland, where his father lived as a man of independent means on the family estate outside Hovmantorp. His mother had died when he was fifteen; his two sisters were older, and since they were both married and lived abroad, in Berlin and Verona, only his father was there, with the old housekeeper. The house was decaying, just as his father was slowly rotting away. He had contracted syphilis in his youth when he was in Paris, and now he sat imprisoned inside an arbour in the summer, alone in his chair. The arbour was pruned so that one had to crawl inside through a hole quite close to the ground. In the autumn his father locked himself in his bedchamber and stayed there through the whole six months of winter, motionless, staring at the ceiling and grinding his teeth until the warmth of spring returned.

Bengler's grandfather had been fortunate in his business speculations during the Napoleonic Wars, and there was still some capital left, although it was much diminished. The estate was mortgaged to the rooftops, and every time he visited his childhood home he realised that this was all the inheritance he could expect. Nothing but the monthly allowances that made it possible for him to survive in Lund.

His father was a shadow and had never been anything else. And yet Bengler visited him in in Hovmantorp that summer to obtain his blessing. He had a vague hope that his father would be able to give him a little financial support for the expedition he was planning.

In addition, and this was the most important thing, he knew that it was time to say goodbye. His father would soon be gone.

From Växjö he got a lift from a travelling salesman who was going to Lessebo. The wagon was uncomfortable, the road was bad, and there was a strong smell of mould from the salesman's coat. He was indeed wearing a fur coat even though it was early June – not full summer heat yet, but already warm.

'Hovmantorp,' he said after an hour had passed. 'A fine-sounding name. But there's nothing there.'

Then they introduced themselves. That never would have happened when they met the night before, as he went round the inns in the little town looking for a ride.

'Hans Bengler.'

The travelling salesman pondered for several kilometres before he replied.

'That doesn't sound Swedish,' he said. 'But what is Swedish anyway, other than endless roads through equally endless forests? My name isn't Swedish either. It's Puttmansson, Natanael Puttmansson, and belongs to the chosen yet exiled people. I sell brushes and household remedies for barrenness and gout.'

'There's some Walloon in my lineage,' replied Hans Bengler. 'A bit of French. There's a Huguenot in the family too, and a Finn. And a French cavalry captain who served under Napoleon and took a shot through the forehead at Austerlitz. But my name is genuine.'

They rattled on further. A lake glittered among the trees. He's certainly not talkative, Bengler thought. Big forests either make people silent or make them talk incessantly. I'm thankful that this salesman...