Fabel returned Wagner’s gaze blankly, but he found himself wondering what was in the dossier. The truth was that as far as Fabel was concerned Vitrenko had ceased to be a person, a human being. He was a spectre.

‘The Vitrenko Dossier has cost lives to compile, Herr Fabel. Much of the intelligence has come from Ukrainian undercover operations as well as from our own resources. We believe Vitrenko is aware of the dossier and would give anything to get his hands on it.’

‘Why? It would only confirm what he can probably guess we know,’ Fabel asked in spite of himself.

‘Vitrenko is obsessive about loyalty. There are two versions of the Vitrenko Dossier. The master dossier and the working dossier. The main reason is that there is a limit to the intelligence we can share with our Ukrainian colleagues, which I know frustrates them. But the simple fact is that there is still a considerable amount of corruption within the Ukrainian security apparatus, added to which even the Ukrainians don’t know how many of Vitrenko’s people have infiltrated their own ranks. That’s why the working dossier is the one that all members of the task force work with. It gives all the most important intelligence but doesn’t identify the sources, which the master dossier does. But even if Vitrenko got his hands on just the working dossier, there would be enough clues in there for him to identify our sources within his organisation.’

‘But surely there aren’t any? Vitrenko’s men are fanatically loyal to him.’

‘That’s very true. But when he merged his operation with that of Valeri Molokov, he compromised his security. Molokov has less noble ideas about his chosen profession. Like Vitrenko he is ex-security services, in his case Russian rather than Ukrainian, but he is a good old-fashioned gangster, plain and simple. There is no grand philosophy uniting his men. Just greed and violence.’ Wagner paused, as if waiting for a reaction from Fabel.

‘Well, as I said – Vasyl Vitrenko, his operation, his associates … it’s all someone else’s problem now,’ said Fabel.

Van Heiden and Wagner exchanged resigned looks.

‘Would you at least think it over?’ asked van Heiden. ‘I am prepared to hold your position open for a further three months. Senior Commissar Meyer has agreed to head the department in the interim. After that, I will have to replace you.’

‘You can replace me now, Herr van Heiden. My mind is made up.’

‘Listen,’ said Wagner. ‘I accept what you’re saying, but in the meantime I wonder if you would look at this for me.’ He handed Fabel a thick file. ‘Just for your opinion. I understand that you won’t want to be involved directly, but if you could look at it I’d be obliged. Just for ideas.’

‘What is it?’ Fabel took the file and eyed it suspiciously.

‘It’s from the Polizei Nordrhein-Westfalen … There’s a Criminal Commissar Scholz working out of the Police Presidium in Cologne. He asked me if you would consider going down there to help with this case, but I understand now that that is out of the question.’