‘I mean he must have put hidden cameras in the apartments when he was fitting the alarms because it shows the victims going about their daily lives. It’s clear he’s edited it down a lot because it’s mainly of an intimate nature. Them getting changed, walking round naked. In one case having sex. That sort of thing. I suppose it made it more fun for him. Stalking them like that but without running any risk of getting caught.’

‘And is there footage like this of all of the victims?’

‘Three that we’ve found so far.’

MacLeod ran a hand across his brow. ‘Good God.’

‘Is there any way it could have been planted on his laptop?’ Tina asked.

Grier looked at her like she was mad, and she remembered immediately why she didn’t like him. ‘No way. There’s so much of it for a start, and the dates the footage was first added to the system tie in with the dates of the murders. This stuff’s been put on there over a long period of time. It’s authentic, and it belongs to that computer.’

‘Were the files well hidden?’

‘They were in a folder within a folder within a folder, squirrelled away among a lot of other files in the My Documents section, all with bland, irrelevant names. It was quite a trawl to locate them.’

‘They weren’t that well hidden though, were they? They didn’t have password protection or an encryption system like some of the paedophile networks put on their PCs to stop us accessing the hard drive?’

Grier looked defensive. ‘Are you suggesting they were easy to find, ma’am?’ he asked her.

‘I don’t think Tina’s saying that at all, Dan,’ put in MacLeod hastily.

‘No, I’m not. I’m just checking the facts. That’s all, Dan. OK?’

‘I’m sorry,’ he said. ‘I didn’t mean to sound disrespectful, it’s just I’ve been here with that laptop for most of the last twelve hours trawling through reams of crap until I finally found them.’