I can see everything: the texture of the rope, the frayed parts. How it has cut into her flesh. The bulging eyes, the purple-grey hollows beneath them, the thick protruding tongue, livid bruises on the skin around her mouth, a white, crusty ridge along her lower lip . . .

I smell smoke. Closer than before. Mary.

‘I see you’ve found Martha,’ she says.

The hardest thing I’ve ever had to do was get through the court case, with Her staring at me as if she wanted to lunge across the court and gouge out my eyes, and Him determinedly looking down at his lap so that he wouldn’t see my face. Forcing myself to go to Mary Trelease’s house for the first time was the second hardest.

It’s possible to do anything, however difficult, if you can’t imagine how your life will go on otherwise. Aidan had said to me, ‘Bring me the picture,’ so I had no choice. After London, he would barely speak to me, apart from telling me constantly that he loved me, with a shadow behind his eyes, and I started to suspect he was using sex as a way of avoiding conversation. The comfort it offered soon ceased to have an effect, and I saw that we couldn’t go on as we were. Every time I pleaded with him to open up to me, he repeated what he’d said at Alexandra Palace: ‘Bring me the picture. Bring me Abberton.’

I thought that if I could only put the painting in front of him, with Mary Trelease’s name and the date on it, he would see that he hadn’t killed Mary, whatever else might have passed between them. I didn’t care if I never knew what that was; all I wanted was to be happy again, for Aidan to be happy. He’d moved into the lodge, as promised, as soon as we got back to Spilling after the art fair, and I was trying hard not to think of it as him making good his threat. I longed for him to trust me as he had before London, knowing it was down to me to make that happen.

On 2 January, after a desolate Christmas, I steeled myself and phoned Saul Hansard. ‘Ruth,’ he said, sounding thrilled to hear from me. I felt guilty for having cut him out of my life, but knew I would again as soon as I’d got the information I needed from him. The sound of his voice made my skin prickle with shame.

‘Mary Trelease,’ I said. ‘I need her address.’

I should have known this would worry him, but I was having trouble thinking beyond my own needs and fears, mine and Aidan’s. ‘Why?’ Saul asked gently. ‘Whatever you’re thinking of doing, I’m not sure it’s a good idea.’

‘I’m not going to cause any trouble,’ I said. ‘I want to talk to her, that’s all.’