It’s a recording on a mobile phone by the looks of it, the angle of the screen showing that it has been propped against something, I think. I recognize it as Sadie’s house – her kitchen to be precise, and I hold my breath as two people come into view – Sadie and Rupert – Sadie leaning against the kitchen counter, Rupert standing close to her. She’s wearing the dress she wore to her garden party, and my breath sticks in my throat as I realize it is the night of Sadie and Miles’s Easter party. The night Rupert proposed to me. The night Rupert told me that he hadn’t seen anyone when he went downstairs.

Sadie has her arms around Rupert’s neck, and they are talking, but the sound is muted. I turn up the volume on the phone as high as it will go, but it’s difficult to make out the words. It sounds as though Sadie says to Rupert, ‘It should have been me,’ but I can’t make out Rupert’s reply and his back is to the screen so I can’t even lip read. Adrenaline pumps through my veins as I watch them both on the screen, still talking quietly, before Rupert raises his voice and finally, I am able to hear what Rupert says.

‘Sadie, I love you.’ His words are clear, and I feel them as sharply as if Rupert had stabbed me himself. The video ends.

I lay in bed all night, stewing over the video. I replay it three times in the privacy of the downstairs toilet, until Rupert bangs on the door to check if I am OK. Now, in the darkest hours of the early morning, I slide out from under the covers to peer out into the street below, straining my eyes to see if there is a shadowy figure watching the house. Now I know that Caro is dead, I know she can’t have sent the video, so who did?

Rupert snuffles in his sleep, rolling over onto his back and I hold my breath for a moment, until I am sure he won’t wake up. The cold from the oak floor is seeping into my toes, and I shiver, although I don’t feel cold. I feel as though I am burning up from the inside out, the way you do when you have the flu. Clicking my phone onto silent, I replay the video again, the screen casting a blue glow across my features.

Without the sound, I can focus on their body language and I’m sure it’s not my imagination that Rupert doesn’t look entirely comfortable as Sadie latches her arms around his neck. She, on the other hand, looks as though she is enjoying it far too much, although her eyes are half closed and she looks as though she’s had far too much to drink. I am trying to be generous.