Yes! Caro had known they had to still be together. Her deductive skills were second to none.

‘It’s not about wanting to know,’ Caro said, sagely. ‘It’s about having all the information we need for our investigation.’

‘You were together before he married Isobel, right?’ Posy asked. ‘You said earlier that Isobel thinks Hugh is having an affair – does she know it’s with you?’

Rosalind shook her head. ‘I don’t think she’d have mentioned it to me if she did. But Hugh denies there’s anything going on with anyone else.’

Caro snorted at that. ‘Well he would, wouldn’t he?’

That earned her an annoyed glare from Rosalind. ‘I don’t think he’s lying to me.’

‘But you can’t be sure.’ Posy shrugged apologetically as Rosalind turned the glare on her ‘You can’t. None of us can ever really be sure that someone else isn’t lying, can we?’

‘But we can be sure when they are, if we know the truth,’ Caro said, thinking hard. ‘That’s what Dahlia always does – she deduces what the truth must be, then tricks the liar into admitting the lie.’

‘How, exactly, are we supposed to prove that something didn’t happen?’ Rosalind’s eyebrows arched in a way that almost looked like Dahlia, but not quite.

‘I haven’t figured that part out yet,’ Caro admitted. ‘But give me time.’

‘What else?’ Posy focused on Rosalind, her stare pressing for more secrets, more answers.

Rosalind shrugged. ‘That’s my big secret. The one that would ruin my reputation, my friendships. What else can you possibly want to know?’

‘Their secrets,’ Caro answered. ‘Isobel, Hugh, the whole family. What do you know about them that they wouldn’t want others to know? Hugh was being blackmailed, remember. Maybe it was about another affair, but maybe it wasn’t. If you’re right, then there must be something else.’

Eyes wide, Rosalind shook her head. ‘I honestly don’t know. I mean, there was everything with Serena, Juliette’s mother … but Isobel wasn’t able to keep that a secret, anyway.’

‘What happened?’ Posy asked.

‘Serena ran away from home when she was seventeen,’ Rosalind said. ‘Moved to London, mixed with a bad crowd, all the usual clichés. She was … she is an addict. She fell pregnant and called Isobel. They got her into rehab, brought her home, and brought Juliette up ever since. Serena … struggled, even after she got clean. Depression, more than anything. She’s relapsed a few times over the past seventeen years, and never really been able to hold down a job or anything else in between. She’s in rehab again right now.’

Posy looked at her hands; Caro suspected she was thinking of her own experiences with rehab.

‘Sad,’ Caro said, so Posy didn’t have to say anything. ‘But not a scandal. Not when it’s more or less public record. What else?’