Illmann nodded. ‘An analysis of his statement reveals a number of discrepancies with the known facts,’ he said. ‘His statement says that he used a stocking for the strangulations. The evidence, however, shows quite clearly that bare hands were used. He says that he stabbed his victims in the stomach. The evidence shows that none of them was stabbed, that they were all slashed across the throat. Then there is the fact that the fourth murder must have occurred while Kahn was in custody. Could this murder be the work of a different killer, someone copying the first three? No. Because there has been no press coverage of the first three to copy. And no, because the similarities between all four murders are too strong. They are all the work of the same man.’ He smiled at Frau Kalau vom Hofe. ‘Is there anything you wish to add to that, madam?’

‘Only that that man could not possibly be Josef Kahn,’ she said. ‘And that Josef Kahn has been the subject of a form of fraud that one might have thought was impossible in the Third Reich.’ There was a smile on her mouth as she closed her file and sat back in her chair, opening her cigarette case. Smoking, like being a doctor, was something else that women weren’t supposed to do, but I could see that it wasn’t the sort of thing that would have given her too many qualms.

It was the count who spoke next.

‘In the light of this information, may one inquire of the Reichskriminaldirektor if the ban on news-reporting that has applied in this case will now be lifted?’ His belt creaked as he leant across the table, apparently eager to hear Nebe’s reply. The son of a well-known general who was now the ambassador to Moscow, young von der Schulenberg was impeccably well-connected. When Nebe didn’t answer, he added: ‘I don’t see how one can possibly impress upon the parents of girls in Berlin the need for caution without some sort of official statement in the newspapers. Naturally I will make sure that every Anwärter on the force is made aware of the need for vigilance on the street. However, it would be easier for my men in Orpo if there were some assistance from the Reich Ministry of Propaganda.’

‘It’s an accepted fact in criminology,’ said Nebe smoothly, ‘that publicity can act as an encouragement to a murderer like this, as I’m sure Frau Kalau vom Hofe will confirm.’

‘That’s correct,’ she said. ‘Mass murderers do seem to like to read about themselves in the newspapers.’