‘Yes. He told us that Mutschmann had once told him that if he were ever really wanted so that he was desperate, then he should probably think of hiding in a prison, or a KZ. Well, of course, with a gang of criminals looking for him, not to mention ourselves, then desperate is exactly what he must have been.’

‘It’s an old trick,’ explained Sohst. ‘You avoid arrest for one thing by having yourself arrested for another.’

‘We believe that Mustchmann was arrested and sent to Dachau three nights after the death of Paul Pfarr,’ said Heydrich. With a thin, smug smile he added: ‘Indeed, he was almost begging to be arrested. It seems that he was caught red-handed, painting KPD slogans on the wall of a Kripo Stelle in Neukölln.’

‘A KZ isn’t so bad if you’re a Kozi,’ chuckled Sohst. ‘In comparison with the Jews and the queers. He’ll probably be out in a couple of years.’

I shook my head. ‘I don’t understand,’ I told them. ‘Why don’t you simply have the commandant at Dachau question Mutschmann? What the hell do you need me for?’

Heydrich folded his arms and swung his jackbooted leg so that his toe was almost kicking my kneecap. ‘Involving the commandant at Dachau would also mean having to inform Himmler, which I don’t want to do. You see, the Reichsfuhrer is an idealist. He would undoubtedly see it as his duty to use these papers to punish those he perceived to be guilty of crimes against the Reich.’

I recalled Himmler’s letter to Paul Pfarr which Marlene Sahm had shown me at the Olympic Stadium and nodded.

‘I, on the other hand, am a pragmatist, and would prefer to use the papers in a rather more tactical way, as and where I require.’

‘In other words, you’re not above a bit of blackmail yourself. Am I right?’

Heydrich smiled thinly. ‘You see through me so easily, Herr Gunther. But you must understand that this is to be an undercover operation. Strictly a matter for Security. On no account should you mention this conversation to anyone.’

‘But there must be somebody among the S S at Dachau that you can trust?’

‘Of course there is,’ said Heydrich. ‘But what do you expect him to do, march up to Mustchmann and ask him where he has hidden the papers? Come now, Herr Gunther, be sensible.’

‘So you want me to find Mustchmann, and get to know him.’

‘Precisely so. Build his trust. Find out where he’s hidden the papers. And having done so, you will identify yourself to my man.’

‘But how will I recognize Mutschmann?’