Perfect Prey. Helen Fields

she said, pointing at the only other door on the same level as Callanach’s in the converted house. His new neighbour was tall and slim, with blonde hair tied up in a ponytail and a broad smile. ‘All my fuses have blown. I’ve absolutely no idea where the fuse box is so I was trying the loft hatch in case the box is up there. I figured, if your layout was the same as mine you might be able to help me. I’m so sorry. I obviously scared you.’

      ‘No, I’m sorry. Just being overcautious. Of course I’ll help. The fuse box will be in your airing cupboard. I’ll fetch a torch.’

      A few moments later he was inside the flat opposite his own, reaching into the top of the cupboard, flipping open the plastic cover, and there was light.

      ‘Nice to meet you,’ she said, thrusting a hand out towards Callanach. ‘I’m Bunny. My real name’s Roberta, but my little sister couldn’t say that when we were growing up. She called me rabbit, hence the nickname, and it kind of stuck. Thanks for helping. And I’m talking too much. Listen, I haven’t got much in, but can I at least get you a beer? Plenty in the fridge.’

      ‘I should go,’ Callanach said, glancing at his watch. ‘You should really get a chain put on your door.’

      ‘I will, especially living alone. What about you?’ Bunny asked.

      ‘I have a chain …’

      ‘No, I meant do you live alone?’

      Callanach paused as Bunny opened the fridge door. By the time he’d figured out how to answer, she was pushing a cold bottle into his hand.

      ‘Yes,’ he said. ‘I live alone. But I’m not at home very often, so you should really make sure that you have proper security in place.’

      ‘I’ll remember that. Feel better knowing you’re just over the corridor though.’ She waited for him to say something and Callanach realised he hadn’t introduced himself.

      ‘Callanach,’ he said. ‘Luc.’

      ‘That’s foreign, right?’

      ‘French,’ he said.

      ‘Oh my God. My mates are just going to die when they meet you. Well, slàinte, good health, Luc Callanach,’ she said, clinking the neck of her bottle against his. ‘Here’s to many an evening spent with a beer in hand and a friend to share it with. So tell me about you. Lived here long?’

      ‘Not that long,’ Callanach replied, looking around. The apartment was full of boxes, most overflowing with clothes, electrical gadgetry and accessories. Unpacking was going to take a while.

      ‘Messy isn’t it?’ she said, following his eyeline and kicking a couple of boxes shut. ‘I’m so busy with work I couldn’t stop to unpack properly. I’m a hair and make-up artist. Anything from weddings to films. You should be an actor with that face.’

      ‘The police service doesn’t approve of moonlighting,’ Callanach said quickly. ‘And I’ve got to be back on duty in a few hours so I really should go now. Thank you for the beer.’

      ‘Being a policeman must be exciting. And those poor people killed this week. Awful, wasn’t it?’ Callanach made his way back out into the corridor. ‘Listen, we’re neighbours. Let me give you my number, in case you need anything.’ Before he could stop her, she grabbed a pen from her pocket followed by his hand and began scribbling on it. Callanach fought the urge to pull away. ‘There’s my number. I’m a terrible sleeper so call any time. It’s going to be fun living here, I can already tell.’ It took another ten minutes to get away.

      There was an email from Tripp when he got back into his own flat. ‘Sir, on my way over. Couple of video files you might want to see tonight.’ It was timed fifteen minutes earlier. Callanach threw dirty plates into the dishwasher and closed some doors. He was waiting for Tripp to knock when he heard voices in the corridor. Evidently Bunny hadn’t shut her door since he’d left and had found Tripp before he’d had a chance to reach Callanach.

      ‘Constable,’ he said, sticking his head out. ‘I gather this is urgent. We should get on.’

      ‘Sorry, Luc,’ Bunny shouted. ‘We got chatting. He’s sweet, he is.’

      Tripp looked like he didn’t know which way to run.

      ‘In you come, Tripp,’ Callanach instructed. ‘And you should shut your door, Bunny. It’s late.’

      Safely inside, Tripp was a shade of beetroot.

      ‘New neighbour then, sir? She seems very, um, enthusiastic.’ Tripp raised his eyebrows and seemed to be struggling to control a grin.

      ‘Was there something important, detective constable? Only I was hoping to get some sleep for the first time in several days.’

      ‘Of course, yes. Couldn’t send the files over the internet. No time to securely encode them. Here you go.’ Tripp opened a laptop, and clicked on a folder in which two items sat. As the first played, Callanach could hear the now familiar song that the band had been playing when Sim Thorburn had hit the floor. The footage was taken from a few rows in front of the victim, on a mobile phone whose owner was obviously taking a selfie of herself singing along. For a split second, in the background, a shadow passed across Sim’s face. As the shadow cleared the screen, Sim could be seen slightly out of focus, looking down towards his stomach, his face registering confusion. Then he lurched to one side, out of shot.

      ‘Is that all?’ Callanach asked. ‘It doesn’t tell us any more about the attacker.’

      ‘One more piece of footage,’ Tripp said. ‘Top right-hand corner of the screen.’

      Tripp pressed play. More mobile footage, this time obviously designed to show the scale of the audience, mobile held high in the air, turning around in a three-sixty loop. After a few seconds, Tripp pressed pause and pointed.

      ‘There,’ he said. ‘Only in shot for a second, but it’s clearer than in the previous footage.’

      Callanach looked more closely. Sim Thorburn was hidden from view, but he could see Merel and Niek De Vries. To the left of them, walking in profile, was an adult with dark brown hair flopping over their face. The attacker was wearing large, dark sunglasses. Tripp let the video play to show the person’s sudden change of direction away from the camera and into the crowd.

      ‘Male or female?’ Callanach asked.

      ‘Can’t be sure,’ Tripp replied, closing the lid of the laptop. ‘But not that tall, slim and therefore able to move about relatively unnoticed. Caucasian. Hair could be natural or dyed. Might even be a wig. Clothes didn’t stand out to anyone, so no help there.’

      ‘Perfect camouflage,’ Callanach said, leaning back on the couch and closing his eyes.

      ‘Could it be someone from one of the homeless shelters, do you think?’ Tripp asked. ‘Sim would have come into contact with plenty of people suffering mental health problems. No one keeping tabs on them, no one to recognise them.’

      Callanach shook his head.

      ‘I wish I believed that, Max,’ he said. ‘Because sooner or later the person you’re describing would get arrested for something else, have a breakdown and confess, get drunk and show someone the knife. This took planning. It needed care and consideration. More than that, it needed nerves of fucking steel. Can you imagine the psyche of a person who can walk through a crowd of thousands, take out a weapon, cut hard and deep and precisely, then not rush away? To walk on slowly through the crowd, certain you’ve done such a good job that you have the time to get out of there, whilst putting the knife out of sight, making sure you don’t emerge from the crowd covered in blood. This person knew how to cut. They may be a psychopath but they’re not mentally ill, not in the way we think of it. This is someone who feels nothing at all. No panic, no fear, no sense of danger. Nothing at all.’

      ‘How do we catch them then, sir, if they’re that good?’ Tripp asked.

      ‘You know what,