‘I know, and very clever it was. When Liz was last seen alive at nine o’clock, you were a hundred miles away. And you were still a hundred miles away when her body was found an hour later.’

‘Then how do you think I did it?’

‘I’ve already said. You didn’t.’

‘What?’

‘You didn’t kill your wife. You killed Stefan Dunwoody.’

‘What?’

‘That’s right. It was you who killed Stefan. And who then tied the bronze medallion with “Faith” written on it into his jacket buttonhole. I perhaps should have guessed that a rower killed Stefan sooner. After all, only a rower would attach a medallion like that to someone, like you do with your passes to enter the various enclosures at regattas.’

‘This is crazy.’

‘Oh no, this is the opposite of crazy. It was very rational. Shockingly so in fact.’

‘You think I killed that Stefan guy? I didn’t even know him. It was only Liz who knew him.’

‘Which is what makes your crime all the worse. You killed him in cold blood. And the thing is, I wondered at the time why Stefan was shot at the end of his garden. I couldn’t work out how he’d got there. You see, Elliot Howard was my number one suspect for Stefan’s death. Stefan didn’t like Elliot at all. In fact, he suspected Elliot of having broken into his house. So if Elliot came to his house, how did they end up at the bottom of the garden? Exactly how had that conversation gone? “Hello, Stefan,” Elliot would have said. “I know you hate me, but could we go for a stroll in your garden?” It made no sense.

‘But what if the killer came from the river? Well, that was a different matter. Because you’re right. Stefan didn’t know you from Adam. So when you appeared at the bottom of his garden, he would have been surprised, but not fearful.’

‘What do you mean, when I appeared at the bottom of his garden?’