“You were in the living room,” she said. “Tom was upstairs. You were waiting for him to come downstairs to talk about whether to reduce the house price or not. And then you heard the crash. The living room door was half-closed. You didn’t see him fall. When you heard the crash you went into the hall, saw him on the floor, and then you saw me through the glass, just as it happened. Exactly as it happened, remember? You had felt his pulse and were crouching down and that’s when you noticed me. But I’d seen everything. I saw him fall downstairs and saw you come out of the living room.”

I couldn’t make sense of it.

“Let’s go into the living room now.” She guided me in there. I was shaking so hard it was difficult to walk. “Now sit in your usual place.”

I collapsed onto the sofa.

“Look at the door. That’s how it was when he fell. You can’t see the hallway from there. And that’s where you were sitting when you heard him fall.”

I thought she was trying to trick me. I started to speak, to object, but she interrupted me.

“And there’s coffee here. Did you have a drink with Tom?”

I nodded. I actually thought she was crazy at this point. “He was showing some people around the house and then he got changed out of his suit and made me a cup of coffee.”

“So why had he gone upstairs? Think!” she urged. “What could he have been looking for upstairs?”

I knew now what she meant but I couldn’t think straight. I pointed to my iPad on the windowsill, behind the curtain. “He was looking for the iPad. We were going to look at other houses online, to compare prices.”

“That’s great. Perfect. And he couldn’t find it and he was in a hurry and fell downstairs.” She gave me an encouraging smile. “Now listen to me carefully. You and I met in a yoga class in Liverpool.”

It took a moment for this to register. “What?”

She repeated it. “We met in a yoga class in Liverpool.”

I was trying to get my head around Tom lying on the hallway floor and Harry’s wife sitting in my living room, talking about yoga. I snapped, “I don’t do yoga!”

She sighed. “You don’t get it. Listen to me. We went to yoga in Matthew Street. I can’t remember the name of the studio and neither can you. We used to pay in cash. The instructor went off to India. To Goa, I think.” She spoke so confidently I thought it must have happened. Had I really met her before? “Her name was Janie. I gave you a lift home a couple of times and that’s how I knew where you lived.”

“How did you know where I lived?”