‘I told you,’ she said. Her voice was strangely calm. ‘I told you this was what she was like. But you wouldn’t listen.’

‘I think we –’

She lifted a hand, stopping Sam. ‘This is not the first time. Oh, no. She disappeared for days before, when she was meant to be at boarding-school. I blame them, of course. They were meant to know exactly where she was at all times. They only rang us when she’d been gone forty-eight hours and then we had to get the police involved. Apparently one of the girls in her dorm had lied for her. Why they couldn’t tell who was and who wasn’t there is completely beyond me, especially given the ridiculous fees we pay. Francis was all for suing them. He was called out of his annual board meeting to deal with it. It was a huge embarrassment.’

Upstairs there was a crash and somebody started to cry. Tanya walked to the kitchen door. ‘Lena! Take them out to the park, for goodness’ sake!’ She came back into the kitchen. ‘You know she gets drunk. She takes drugs. She stole my Mappin & Webb diamond earrings. She won’t admit it, but she did. They were worth thousands. I have no idea what she did with them. She’s taken a digital camera, too.’

I thought back to my missing jewellery and something in me tightened uncomfortably.

‘So, yes. This is all rather predictable. I did tell you. And now, if you’ll excuse me, I really have to go and sort the boys out. They’re having a difficult day.’

‘But you’ll call the police, yes? She’s sixteen years old and it’s been almost ten days.’

‘They won’t be interested. Not once they know who it is.’ Tanya held up a slender finger. ‘Expelled from two schools for truanting. Cautioned for possession of a class-A drug. Drunk and disorderly. Shoplifting. What’s the phrase? My daughter has “form”. To be perfectly frank, even if the police do find her and bring her back here, she’ll simply up and go again when it suits her.’

A wire had tightened across my chest, constricting my breath. Where would she have gone? Was that boy, the one who hung around outside my flat, involved? The nightclubbers who had been with Lily that drunken night? How had I been so distracted?

‘Let’s call them regardless. She’s still very young.’

‘No. I do not want the police involved. Francis is having a very tricky time at work right now. He’s fighting to retain his place on the board. If they get wind that he’s involved in some sort of police business that will be it.’

Sam’s jaw tightened. He took a moment before he spoke. ‘Mrs Houghton-Miller, your daughter is vulnerable. I really think it’s time to get someone else involved.’

‘If you call them I’ll simply explain to them what I’ve just told you.’

‘Mrs Houghton-Miller –’

‘How many times have you met her, Mr Fielding?’ She leaned back against the cooker. ‘You know her better than I do, do you? You’ve been kept up nights waiting for her to come home? You’ve lost sleep? Had to explain her behaviour to teachers and police officers? Apologize to shop assistants for things she’s stolen? Bail out her credit card?’

‘Some of the most chaotic kids are those most at risk.’

‘My daughter is a talented manipulator. She will be with one of her friends. Just as she has been before. I will guarantee that within the next day or two Lily will turn up here, drunk and screeching in the middle of the night, or knocking at Louisa’s door, or begging for money, and you will probably have reason to wish she never had. Someone will let her in and she’ll be sorry and contrite and terribly sad, and then a few days later, she’ll bring a bunch of friends home or steal something. And the whole sorry cycle will revolve again.’

She pushed her golden hair back from her face. She and Sam stared at each other. ‘I’ve had to undergo counselling to cope with the chaos my daughter has brought into my life, Mr Fielding. It’s hard enough coping with her brothers and their … behavioural difficulties. But one of the things you learn in therapy is that there comes a point when you have to take care of yourself. Lily is old enough to make her own decisions –’

‘She’s a child,’ I said.

‘Oh, yes – that’s right. A child you turned out of your apartment some time after midnight.’ Tanya Houghton-Miller held my gaze with the complacency of someone who had just been proven right. ‘Not everything is black and white. Much as we would like it to be.’

‘You’re not even worried, are you?’ I said.

She held my gaze. ‘No, frankly. I’ve been here too many times before.’ I made to speak again but she was ahead of me. ‘Quite the saviour complex, haven’t you, Louisa? Well, my daughter doesn’t need saving. And if she did, I wouldn’t be hugely convinced by your record so far.’

Sam’s arm was around me even before I was able to take a breath. My retort formed, toxic, in my mouth, but she had already turned away. ‘C’mon,’ he said, propelling me out into the hallway. ‘Let’s go.’

We drove around the West End for several hours, slowing to peer at the groups of catcalling, staggering girls, and, more soberly, at the rough sleepers, then parked up and walked side by side along the dark archways under bridges. We put our heads around the doors of nightclubs, asking if anyone had seen the girl in the photographs on my mobile phone. We went to the club where she had taken me dancing, and to a couple more that Sam said were notorious haunts for under-age drinkers. We passed bus stops and fast-food joints, and the further we went the more I thought how ridiculous it was to try to find her among the thousands milling around the humming streets of central London. She could have been anywhere. She seemed to be everywhere. I texted her again, twice, to tell her we were urgently looking for her, and when we got back to my flat Sam rang various hospitals just to be sure she hadn’t been admitted.

Finally we sat on my little sofa and ate some toast, he made me a cup of tea and we sat in silence for a bit.

‘I feel like the worst parent in the world. And I’m not even a parent.’

He leaned forward, his elbows on his knees. ‘You can’t blame yourself.’

‘Yes, I can. What kind of person turfs a sixteen-year-old out of their flat in the small hours without checking where she’s actually going?’ I closed my eyes. ‘I mean, just because she’s disappeared before doesn’t mean she’ll be okay now, does it? She’ll be like one of those teenage runaways who disappear and nobody ever hears of them again until some dog out walking digs up their bones in the woods.’