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.’

‘Louisa.’

‘I should have been stronger. I should have understood her better. I should have thought harder about how young she is. Was. Oh, God, if something’s happened I’ll never forgive myself. And out there right now some innocent dog-walker has no idea that he’s about to have his life ruined –’

‘Louisa.’ Sam put his hand on my leg. ‘Stop. You’re going round in circles. Irritating as she is, it’s entirely possible Tanya Houghton-Miller’s right and Lily will coast in or ring your bell in about three hours’ time and we’ll all feel like fools and forget what’s happened until it all starts again.’

‘But why won’t she answer her phone? She must know I’m worried.’

‘Perhaps that’s why she’s ignoring you.’ He gave me a wry look. ‘She may be enjoying making you sweat a little. Look, there’s not much more we can do tonight. And I’ve got to go. I have an early shift.’ He cleared away the plates and put them in the sink, leaning back against the kitchen cabinets.

‘Sorry,’ I said. ‘Not exactly the most fun start to a relationship.’

He lowered his chin. ‘This is a relationship now?’

I felt myself colour. ‘Well, I didn’t mean –’

‘I’m kidding.’ He reached out a hand and pulled me to him. ‘I quite enjoy your determined attempts to convince me you’re basically just using me for sex.’

He smelt good. Even when he smelt faintly of anaesthetic, he smelt good. He kissed the top of my head. ‘We’ll find her,’ he said, as he left.

After he’d gone, I climbed up onto the roof. I sat in the dark, inhaling the scent of the jasmine she’d trained up the edge of the water tank, and ran my hand softly over the tiny purple heads of the aubretia that tumbled over the terracotta planters. I looked over the parapet, scanned the winking streets of the city and my legs didn’t even tremble. I texted her again, then got ready for bed, feeling the silence of the flat close in around me.

I checked my phone for the millionth time, and then my email, just in case. Nothing. But there was one from Nathan:

Congratulations! Old man Gopnik told me this morning he’s going to offer you the job! See you in NY, mate!

CHAPTER NINETEEN

Lily

Peter is waiting again. Out of the window, she sees him standing against his car. He spots her, gestures up and mouths, ‘You owe me.’

Lily opens the window, glances across the road to where Samir is putting out a fresh box of oranges. ‘Leave me alone, Peter.’

‘You know what’ll happen …’

‘I’ve given you enough. Just leave me alone, okay?’

‘Bad move, Lily.’ He raises an eyebrow. He waits just long enough for her to feel uncomfortable. Lou will be home in half an hour. He hangs around so often she’s pretty sure he knows this. Eventually he climbs back into his car, and pulls out onto the main road without looking. As he drives off he holds his phone out of the driver’s window. A message: Bad move, Lily.

Spin the bottle. Such an innocent-sounding game. It had been her and four girls from her school and they had come up to London on an exeat. They had stolen lipsticks from Boots and bought too-short skirts in Top Shop and got into nightclubs for free because they were young and cute and doormen didn’t ask too many questions if there were five of you and you were young and cute, and inside, over rum and Cokes, they had met Peter and his friends.

They had ended up in someone’s flat in Marylebone at two a.m. She couldn’t entirely remember how they had got there. Everyone was sitting in a circle, smoking and drinking. She had said yes to everything that was offered her. Rihanna on the music system. A blue beanbag that smelt of Febreze. Nicole had been ill in the bathroom, the idiot. Time had slipped; two thirty, three seventeen, four … She lost track. Then someone had suggested Truth or Dare.