Kate is sitting on the train from Cornwall to London, watching the Wiltshire countryside slide by. Bex and Stretch dropped her off at Truro station this morning, later than she planned. She and Bex both overslept, having stayed up late to talk about what they’d seen on the beach. Bex is going to hang out at the house for a few days, drive around in the Tesla with Stretch.

The train will soon be passing through Kate’s old village, where she shared so much of her life with Jake, and she should be able to see their boat – what’s left of the burnt-out hulk. She’s not sure if she wants to.

She’s still cross with Jake for logging into her Facebook account, but it was good to talk to him last night about Capgras. And to hear about the story that Kirby told him online – told her; she must remember that. Rob’s encounter with Gil in Thailand fits with what Rob told her – his fear of being found by his double. But Jake’s right, it doesn’t explain her own suspicions whenever she sees Rob face to face, that he’s been replaced by Gil. That just doesn’t make any sense, on so many levels. Take the piece of beach glass she and Rob found. How would Gil, a man Rob met nine years ago, be aware of that? He certainly wouldn’t know to give it to her as a necklace. It’s ridiculous. She must be suffering from Capgras syndrome. Dr Varma will know. Rob has arranged for her to see him later today.

Her phone rings.

‘You alright?’

It’s Bex, calling her for the third time since they said goodbye at Truro.

‘Just coming up to the village,’ Kate says, her face pressed against the carriage glass.

‘Give it a wave from me,’ Bex says, echoing what Jake said yesterday. ‘I think I’ve been caught speeding – sorry.’

‘Seriously?’

Rob won’t be happy. When Kate spoke to him earlier, he agreed to put Bex on the Tesla insurance as long as she watched her speed.

‘Stretch was on my lap so he can take the points,’ Bex continues.

She’s joking. Of course she is. Kate worries that she lost her sense of humour too after the crash.

‘Goes like a rocket though, doesn’t it?’ Bex says. ‘And it can drive itself, does the parking for you, even blow-dries me hair.’

They chat some more, Bex’s usual joshing cut through with a new note of concern. The sight of a dead man has left them both frightened. Kate knows Bex is worried about her going up to London on her own. She fell very quiet after Kate told her about Kirby and Thailand – Kate had expected her to be outraged by Jake’s behaviour – and she gave Kate an extra-long hug on the platform.