She called up the folder that contained her notes and checked the recent files. There were four murder cases from the past seven weeks. She dismissed a drive-by shooting in a small town between Dresden and the Polish border and the murder of a Turk in Stuttgart. He’d bled to death following the amputation by machete of both hands. Petra had thought it was probably more to do with some domestic settling of scores than any organized criminal activity, since the local cops hadn’t come up with a single thing to connect the dead man to anything more illegal than an expired visa.

That left two cases. A very strange murder in Heidelberg and the crucifixion of a known drug dealer in Hamburg. Her notes said nothing about pubic scalping, but she seemed to recall it had featured in one or other of those cases. She checked the reference numbers and sent e-mails to both police divisions involved. With luck, she’d have an answer by the end of the day.

Petra headed for the coffee machine, feeling very pleased with herself. She was emptying a sachet of sugar into her cup when her boss, Hanna Plesch, joined her. ‘You’re looking cheerful,’ she said.

‘And you’re going to put a stop to that, right?’ She cocked an eyebrow at her.

‘That shooting over at the GeSa on Friesenstrasse – I want you to do a bit of digging, see what you can come up with.’ Plesch leaned past her and pressed the button for a black coffee.

Petra stirred her coffee thoughtfully. ‘It’s hardly our area, is it? I heard it was being written up as a personal thing. The shooter was the girlfriend of one of the doctored heroin victims, wasn’t she?’

Plesch gave a sardonic smile. ‘That’s the official line. Me, I think it stinks. She’s on our files, you know, the woman who did the shooting. Marlene Krebs. We had intelligence that she was dealing in Mitte. Small fry, so we left her alone. But we heard she’s tied in to Darko Krasic’

‘Which means she might be a way through to Radecki,’ Petra continued. ‘So you want me to talk to her?’

Plesch nodded. ‘It could be worth our while. She probably thinks she’s looking at a light sentence if she plays the sympathy card – woman insane with grief takes revenge on the evil drug pusher who destroyed her lover. If we can persuade her that’s not going to happen …’

‘She might just give us something we can use to build a case against Krasic and Radecki.’ Petra sipped her coffee, wincing at the heat.

‘Exactly.’