She froze a moment. ‘Why would … Oh, okay.’ She reached into a drawer, fished out an invoice and passed it over. If she’d worked out what this could mean, she kept it to herself.

I turned to Jai. ‘Do you mind calling them now? And checking on the searches.’

Jai took the paper and left the room.

When I turned back to Anna, her fists were clenched tight in her lap, knuckles shining white.

‘Violet was on a night shift?’ I said.

Anna nodded rapidly. ‘Ten till two thirty. Cleaning. She has a summer job here.’

‘Why did she come to work in an abattoir?’

‘It’s strange, isn’t it? When I found out who she was, I was baffled. I did ask her and she was rather vague. I can’t say for sure, but I got the impression she wanted to come to Gritton for some other reason, and this job was an excuse.’

‘Okay, thank you. And had she worked her shift last night? Could you tell this morning if the cleaning had been done?’

Anna frowned. ‘I’m not sure … We have such high standards here, it’s not as if she was mopping up blood – it’s more of an extra clean. We have what we call a “clean side” and a “dirty side”. She was on the clean side – meat only, no live animals – which is why it’s so strange that her watch turned up near the pig pen on the dirty side. She’s been given specific instructions not to go on the dirty side when she’s cleaning.’

‘Okay. Could you have another look – the guys will tell you where you can go. See if there’s anything to suggest she did or didn’t clean up.’

‘Yes, of course.’

‘Is there any CCTV other than the broken one? Any camera footage that would show if anyone else was here last night.’

She shook her head. ‘Sorry, no. Not on site.’

‘Where were you last night?’

‘At home. But Esther was with me. She doesn’t live with me, but she stayed over. She can confirm I was with her.’

‘Violet lodges with Esther?’

‘Yes. Yes, she does. I helped that girl a lot, even letting her live with my girlfriend.’ Was that a hint of bitterness in her tone?

‘Did Violet not appreciate that help?’ I asked.

‘Oh yes, I’m not saying she didn’t appreciate it.’ A somewhat tight-lipped response.

‘Do you get along with Violet?’

Anna swallowed. ‘She’s all right, I suppose. A good employee generally.’

‘Generally but not totally?’

Anna’s eyes hardened briefly. A flash of steel. ‘Just a turn of phrase. She’s fine.’

I paused to write in my notebook. Anna kept her face expressionless. She clearly didn’t like Violet. Could be relevant. Could be nothing. I spent half my life wanting to throttle my colleague Craig and I hadn’t murdered him yet.