We went down some stairs and into a long alleyway. Outside the door to Poliza’s studio we were met by a man wearing a cream-coloured blazer, a pair of green trousers, a cravat of lime silk and a red carnation. No amount of care or expense had been spared with his appearance, but the overall effect was so lacking in taste that he looked like a gypsy grave.

Poliza took one look at us and decided that we weren’t there selling vacuum-cleaners. He wasn’t much of a runner. His bottom was too big, his legs were too short and his lungs were probably too hard. But by the time we realized what was happening he was nearly ten metres down the alley.

‘You bastard,’ muttered Becker.

The voice of logic must have told Poliza he was being stupid, that Becker and I were easily capable of catching him, but it was probably so hoarsened by fear that it sounded as disquietingly unattractive as we ourselves must have appeared.

There was no such voice for Becker, hoarse or otherwise. Yelling at Poliza to stop, he broke into a smooth and powerful running action. I struggled to keep up with him, but after only a few strides he was well ahead of me. Another few seconds and he would have caught the man.

Then I saw the gun in his hand, a long-barrelled Parabellum, and yelled at both men to stop.

Almost immediately Poliza came to a halt. He began to raise his arms as if to cover his ears against the noise of the gunshot, turning as he collapsed, blood and aqueous humour spilling gelatinously from the bullet’s exit wound in his eye, or what was left of it.

We stood over Poliza’s dead body.

‘What is it with you?’ I said breathlessly. ‘Have you got corns? Are your shoes too tight? Or maybe you didn’t think your lungs were up to it? Listen, Becker, I’ve got ten years on you and I could have caught this man if I’d been wearing a deep-sea-diver’s suit.’

Becker sighed and shook his head.

‘Christ, I’m sorry, sir,’ he said. ‘I only meant to wing him.’ He glanced awkwardly at his pistol, almost as if he didn’t quite believe it could have just killed a man.

‘Wing him? What were you aiming at, his earlobe? Listen, Becker, when you try and wing a man, unless you’re Buffalo Bill you aim at his legs, not try and give him a fucking haircut.’ I looked around, embarrassed, almost expecting a crowd to have gathered, but the alley stayed empty. I nodded down at his pistol. ‘What is that cannon, anyway?’

Becker raised the gun. ‘Artillery Parabellum, sir.’

‘Shit, haven’t you ever heard of the Geneva Convention? That’s enough gun to drill for oil.’