‘OK,’ Mac said slowly, ‘but what if he’s not?’

She glanced at him. ‘Then I’ll call the police, which is another reason why I should warn Rose and Oliver first. Will you stay here in case he does come back?’

Mac nodded and patted his laptop bag. ‘Sure, I’ve a load of pictures to edit – might as well work here as anywhere else.’

She hesitated. ‘Will you call the hospitals too?’

‘Clara, I really don’t think anything …’

‘Please, Mac.’

He held his hands up in defeat. ‘OK, sure.’

As soon as Clara got into her car, she phoned her office, putting her mobile on hands-free, before setting off across town towards the M11. She was almost at the North Circular before her editor grudgingly accepted her explanation of ‘personal problems’ and agreed she could have the next day off. After that she phoned Lauren, who confirmed there’d still been no word from Luke all day. Finally she asked to be put through to the security desk where she reached George, the guard who’d been on duty the night before. He told her that Luke had left the building via the back entrance at around 7.30, that they’d had a brief chat about the football and there’d seemed nothing wrong. ‘You know Luke,’ he chuckled, ‘always got a smile on his face.’

As she drove through the London streets she thought about Luke’s parents. She remembered how nervous she’d been the first time he’d brought her to The Willows, his childhood home in Suffolk. Rose and Oliver had sounded so impressive; so very much larger than life – and so very different from her own mum and dad.

It had been a morning in late May. The house they drew up to stood alone, stark against the bleak beauty of the Suffolk landscape, the seemingly endless flat fields, the sky vast and blue and cloudless above them. Luke had led her around the side of the building through to a long and sweeping garden, its borders a carefully controlled riot of colour, a white lilac tree at its centre heavy with flowers that filled the air with their sweet powdery scent. ‘Wow,’ she’d murmured and Luke had smiled. ‘My mum’s pride and joy, you should see the parties she throws here every summer – the whole village comes along, it’s insane.’ And there, at the far end of the garden, kneeling at a flower bed, secateurs in hand, had been Rose. She’d stood up when she heard them approach, and Clara’s belly had dipped with apprehension. What would this woman, this cultured, educated, retired surgeon, think of her? Would she like her, think her good enough for her son?