‘At ten to ten, le Mesurier goes to the Snuggery and Derek Abbott goes with him. They’re still friends. They’re going to take cocaine together. Maybe they notice Elizabeth Lovell in the garden, but neither of them is aware that she can actually see them. It’s only when they’re inside the Snuggery, and perhaps after they’ve had a couple of lines, that Derek demands the £20,000 that he’s owed for his part in blackmailing Colin Matheson. He’d had to pretend to be the bad guy. He was the one with the hidden camera. He was the one who would tell Judith Matheson that her husband was having an affair with Helen. Of course, as we now know, all three of them – Charles, Helen and Derek – were in it together.

‘Anyway, Derek wants his £20,000, which is actually going to be his pay-off. Le Mesurier fires him, and Anne hears the entire conversation, hiding behind one of those velvet curtains. Why would Charles le Mesurier have told her anything about Abbott at the party? That never made any sense. But it’s a gift as far as she’s concerned. When she tells us that le Mesurier complained about Abbott earlier in the evening, it’s as if she’s looking into the future, using her knowledge of what happened at ten o’clock to point the finger at a known criminal and a man who’s hated across the whole island.

‘In fact, le Mesurier is very much alive when Derek leaves the Snuggery. At that moment, Helen le Mesurier looks out of her bedroom window and later on she’ll assume that since he was there just before her husband died, he must be the one who killed him. That’s why she sends Derek a text. And that’s what will eventually get her killed.

‘So now everything is set up. Charles le Mesurier is on his own in the Snuggery, high on cocaine, waiting for his new girlfriend to arrive. But the moment Kathryn appears, Anne steps out from her hiding place and stuns him with a rock or a brick or whatever she’s picked up from the garden. Together, the two women drag him into the chair and tie him down with the parcel tape. But they leave one hand free.’

‘Why?’ I couldn’t help myself. ‘Why did they do that?’