We went down the stairs, back into the auditorium and down the red carpet to the condemned cell … that was how it felt. But when we entered the stalls, I stopped in surprise. I looked past the long stretch of empty seats to the stage. The curtain was up and there were nine people waiting for us on the set of Mindgame, some of them sitting on the furniture used in the play, others perched on plastic seats that had been brought from backstage. Absurdly, the human skeleton that was part of the action stood in the corner.

The cast was on one side: Jordan Williams next to Sky Palmer, then Tirian Kirke. Ewan Lloyd was nearby but on his own. Ahmet Yurdakul and Maureen Bates came next, sitting side by side, uncomfortably close, on a sofa. Martin Longhurst, their accountant, was behind them. Arthur Throsby and his daughter, Olivia, had also been summoned to the theatre and were over by the window that during the play turned into a wall. They must have been waiting for us for some time and weren’t looking too pleased as the four of us made our way down the aisle. That was when I noticed that Keith, the deputy stage-door manager, had been summoned too. He was sitting, half-hidden, in the wings.

We reached the front of the stage.

‘You stay here,’ Hawthorne said. He was addressing Grunshaw and Mills. He turned to me. ‘You come with me, Tony.’

A flight of steps had been placed against the apron. While the two detectives settled themselves into the first row of the stalls, we climbed up. I noticed an empty chair had been placed centre stage, presumably for me. I sat in it. I was aware of everyone examining me and kept my gaze fixed on the empty auditorium, the invisible audience somehow more unnerving than a real one, all those imagined eyes watching me. Meanwhile, Hawthorne had taken off his coat. He was completely at ease, even enjoying himself. But then in his own way he always had been a performer. He was in his element.

‘Thank you all for coming,’ he began. ‘I know it was a bit short notice, but Detective Inspector Grunshaw here only works until lunchtime on Saturdays.’

‘What is this all about?’ Jordan asked. Typically, he was more annoyed than anyone else.

‘Well, obviously, it’s about the murder of Harriet Throsby. We haven’t come here to rehearse. All of you were involved, one way or another, and I thought you might like to know how it happened.’

‘Do you know who killed my wife?’ Arthur Throsby asked.

He was considerably less mournful than he had been just two days ago when we had first met. He was wearing brand-new clothes, for a start: a colourful blazer and tie. He’d had a haircut. It seemed to me that he’d not only got used to his wife’s death, he had adapted to it and perhaps even found that it suited him. Next to him, Olivia was quiet, clearly nervous.