38 True to her word, McKenna turned up before lunch. Not long before, but still before. She’s accompanied by a man who introduces himself as DC Brennan. True to form, McKenna’s keen to get to the point. ‘So, this new information,’ she says, having rejected the offer of a cup of tea or coffee on behalf of both of them. ‘You think you know Gavin Armitage’s identity.’ ‘Yes,’ I say, pre-empting her asking me who I think it is, and instead feeling the need to explain myself first. ‘And I know that as soon as I tell you your reaction is going to be that I’m crazy. But I need you to listen to me. I know I’m right. I’ve never been more sure of anything in my life. And I really, really need your help because if you can’t help me then I don’t know what’ll happen. I haven’t got anyone else.’ ‘I u