‘Come in,’ says Lucy, a petite Scottish woman with mousey hair held back by a black Alice band with a bow. She closes the door behind them. ‘Thank you for coming. I couldn’t quite believe it when I saw the video.’

‘When did the video come to your attention?’ asks Quinn.

She wrings her hands together as she speaks. ‘A friend of mine sent me the link on Facebook. Since the murders of those homeless men, social media has gone bonkers. It’s everywhere.’

‘You reported your brother as being in one of the videos on YouTube,’ says Quinn.

‘Yes, horrible it was too. The person in that mask . . .’

‘When did you last speak to your brother?’ asks Archer.

‘I already told the police this three weeks ago when I reported him missing.’

‘We’re sorry to ask again, but this is important.’

She shakes her head. ‘It’s OK . . . I’m just worried about him. It was about a month back. We usually talk every week, but I’m married and we have separate lives and different friends and sometimes you just lose track. I did this time and feel so guilty . . .’

‘Why do you feel guilty?’

‘He’s not been very well. He suffers from depression, has done since he was a teenager. I really hope he hasn’t done something silly.’

‘What do you mean by that?’

She shrugs. ‘Well, you hear of people taking their own lives, don’t you?’

‘Was your brother suicidal?’

‘I’d say no, but who knows? He’s my wee brother and I love him, but with depression it feels, sometimes, that I just don’t know him, or what he’s thinking. He’s been missing for weeks, you can’t help but think the worst. I always kept an eye on him when I could and would let myself into his flat if I never heard from him, just in case.’

‘Does he live in London?’

‘Yes, that video was taken in his flat in Clapham. It’s been up on the Internet for three weeks, I checked – since around about the same time he went missing.’

‘I apologise for asking this, but it may be important. Has he been in any trouble?’

Lucy frowns. ‘What do you mean trouble?’

‘Has he been involved with any suspicious people?’

‘No . . . Well, how would I know? He’s my brother, but he’s also a very private person. Anyway, everything is on the police report. What I want to know is why my brother is on that killer’s website?’

‘That’s what we intend to find out,’ says Quinn.

‘You mentioned you let yourself into your brother’s flat. Do you have the keys?’ asks Archer.

‘Yes.’

‘Could we borrow them?’

She looks at them both and shifts on her feet.

‘Just for an hour or two. It could really help us understand what happened to your brother.’

She nods her head. ‘Of course.’